>> this is al jazeera america. we are live from new york. i'm jonathan betz with the top stories. a series of explosions in baghdad kill 18. it include a car bomb debtonated in a predominantly shia neighbourhood. >> shia fighters have been battling tribal forces near fallujah. the u.s. will support the iraqi government but will not put u.s. troops on the ground. >> thousands of families are fleeing their homes in the south sudan city of bor heading north. that's where most of the displaced people are after fighting broke out between government leaders. election-related violence in

bangladesh claimed 16 lives, 300 parliamentary seats are up for grabs. the main opposition party is boycotting the vote, leaving half the seats upcontested. >> millions of americans are bracing for the coldest weather in decades. half the nation will see temperatures of zero or less. it comes after a snow storm that blanketed most of the country. >> "america tonight" is next. you can find us online. go to aljazeera.com. have a good night. good evening, everyone.

thanks for joining us. joie chen is on assignment. i'm adam may and you are watch "america tonight weekend edition", more than 3 million americans suffer from hep c. we meet a family nearly destroyed by the virus and we are shown a drug targetting the poison in their bodies. >> when clyde opens the door to his beloved backyard toolshed, his eyes twinkle with delight. >> i love to work on wood. i have worked on wood since the 7th grade. it's the last bastion of my mann hood that is left. >> this is where many wooden wonders came to life for the retired builder. he made cabinets and cupboards, shelves and built houses until

2007 when a slow, silent killer inside his body forced him to lay down his tools. >> when it hit home i went into work and i walked up to the desk to sign in, and i threw up right there in front of the sign-in desk. that was the last day i worked. that was the last day. i laid on the couch for two years. >> hep c had been poisoning his liver since he received a blood transfusion at age 13. >> it takes that long. you came close to death. >> yes. i was just months away. i mean, and i still never gave up. i didn't want to give up. i went through fibrosis, yellow. my eyes were yellow, my skin. >> are you able to watch your brother deteriorate. >> the ammonia builds up. he was having moments where he didn't know us.

that was scary. then you think each if it gets his liver fix, is his brain gone. do you see that that is part of the damage. >> i watched him lose muscle mass, weight, watched the skin challenge colour and watched him become ill, weak. >> for clyde's mother and brother, watching collide approach death was particularly tough. in a strange twist, it was the same fate each of them had faced, both had been diagnosed with hep c. neither know how they got it. >> thinking back to that time, when you find out you are like - you think you're going to die. >> yes. sorry, thinking about it, he had it, i had it. like, we are all going to die. >> the national institutes of

health estimate as many as 180 million worldwide are effected with the disease. >> the sickness leads to 17,000 deaths in the united states. it spreads through contact with infected blood. dr anthony treatment. >> there has been treatment, but it has not been overwhelmingly effective. it has had considerable toxicity. >> traditional treatment involves months of interferon injections causing sympto symptoms, anemia. the cure rate is 40%. >> when you underwent treatment, endure? >> the side effects are an intense chilling sensation that you can't get rid of. you can't warm up. you freeze from the inside out.

you but blankets on, but you are cold inside. you are blanket. >> dan tried various treatments and cleared the virus in 2012. after seven failed treatments and a brush with death, clyde underwent a liver transplant, a combination of trucks with painful side effects are treating him. >> joan is still fighting. >> i did four main treatments, and an experimental treatment. i was the only patient and that was one where my skin came off, not just the toplayer, and the skin came off. and there was one where i threw up for, like, eight straight hours, and it subsided. >> the f.d.a. approved a new treatment that could change joan's future and the lives of other hep c patients. >> it comes in the form of a pill.

it offers a faster path to a cure in half the time with fewer side effects. the cure rate used in conjunction with other medication can be as high as 90%. >> it can be given as a single pill, orally. we are close to curing hep c without toxic drugs in a considerable portion of people, now that we can do it, let's find the people that are infected and dreet them. >> dr fauccii says it's part of a drug called direct acting agents. unlike other drugs, which stimulate the immune system to fight off the disease. the medication targets the virus to prevent if from replicating. >> i'm generally considered a conservative in my predictions for disease.

i don't talk in terms of breakthroughs or what have you. but i think that with the use of combination direct-acting agents, that we can see the light at the end of the tunnel, that we might be able to essentially cure most of the people who have this disease. now, it's very dangerous for a scientist and a health official to give a specific time, but i would say not very much more than five years away. >> dr fauci says with success on the horizon, a key obstacle in the fight against it is identifying patients who suffer from it. according to the c d.c., up to three in four people infected don't know it because they don't feel sick. >> so we are in one of those interesting dilemmas were you develop a therapeutic regiment for a deadly disease. that is step one. step 2 is to access the people

who are infected. >> everyone should get tested. it's a simple text that takes no time. results come back quick. >> the c d.c. recommends baby boomers get tested before it's too late. for john and her family, news of a cure means she has another chance at life. come? >> no. >> what did you think would happen? >> everybody has little benchmarks. even though i'm not in imminent danger, the fatigue sometimes is so overwhelming that i worry about going to my grandson's graduation. and i want to be there. it's the tinges that you miss, and i think they are the chance. i'll be able to do things with my family again. >> a lot of promise there. that's "america tonight"'s laurie jane glooe har.

after the break, stupid cupid. what is the trouble with love online. we meet veteran singles looking for their soul mate. what are they doing wrong? >> every sunday night, al jazeera america presents extraordinary films from the worlds top documentary directors this week: is love enough? >> that was a dream of ours... four children.... >> a little girl, removed from everything she's ever known... >> she's gone through a ton of orphan stuff... >> if their hopes don't turn out to be the reality...are they gonna crash? >> an unflinching look at a family learning to love >> i think she could have used a hug... >> dark matter of love on al jazeera america

>> it used to be u.n. conventional, taboo and an odd way of meeting someone, clicking through online profiles and match-making websites. these days it's a staple and there's a flavour for everyone. we look at how online dating changed romance, and the biggest mistakes people make on the online profiles. >> why. >> is it decent? >> why a car. >> not even a car. >> why do a car.

>> they are veterans of online dating. a decade and a half after dating online went mainstream these singles have been there and done that, and yet they can still be surprised by the experience. >> don't eat them quick. this is dating 101. a dude will show up. >> i've done that. >> women are professionals with angles. they can work skinny and booty sticking out, and when you see them they look like bubba smith. >> "america tonight" gathered these la singles to share their online dating stories. all of them say they are looking for love. but between traffic, work obligations and a lack of time, love gets lost somewhere in the hollywood hills.

online. >> i think the men are. they stopped courting and having the initial leadership in a relationship. they depend on us to be the one to send messages and chase. dating. >> men don't know what to do. we thought we wanted that. old school way is you chase the girl down. >> but they don't. >> it's a $2 billion a year industry in the u.s. alone. the number of online dating sites, 2500 and growing. the newest kid on the block. where singles pop up on your phone based on how close they are. you significantly say yes or no. >> it will show me who is nearby. so sam is nearby. >> he's gorgeous. information. >> it's like instant judgment. >> it totally is. >> online these sites

abound, such as grindr, and gay hook ups and positive singles for people with herpies. there are sites for extramarital dating such as ashley maddison, and we, a site to keep married couples together. with 118 married singles competing for a first glance, the competition can be stiff. >> i agree with that. >> it's shocking. >> the human shopping network. you get addicted to it. >> if you are on any of these sites, i could go on five times a day. you don't have time for that. >> i don't want to sit back and wait. i want to decide what i want. i don't want to be chosen, i want to choose. >> according to a 2013 pew research centre 38% of american adults who are single and looking for a partner are looking online.

23% have met their spouse or long-time partner through the sites. still, for all the choices dating online or off can be tough. you might call it fickle love, and one of the biggest issues... >> it's smoking chemistry for compatibility. first dates is hope, fantasies, participation. you go out with someone, it feels right and the next thing you know you picture your future. this is the person that will save me from a life of loneliness. online dating is not the cause of that, it's people. this is people immemorial acted this way. it's the roamio and jewel yet story. i dealt with people 5 foot 3, in their 70s, in wheelchairs. >> evan has heard it all, he's a dating coach specialising in women. >> i am a dating coach for women and thinks women do it wrong.

>> you tend to say things that are agreeable, right. me too. you like skiing, "i like skying." "you have a dog?" i have a dog. "you have two eyes? i have two eyes, we should go out." >> what makes a good online dating profile. >> i'm glad you asked. it's not what people think. people list things. they list adjectives, hobbies and cliches. i like hiking, music and travel. i'm looking for my best friend and partner. >> is it wrong to put online. >> it may be articulate or accurate. if everybody says some version of the same thing, so the point is that it has no power. >> and his advice - do reverse engineering. that means instead of starting with yourself, start with what your potential date would find there.

>> it's your profile, it should be about you. what is the person who is reading it thinking. you quit your job to protest human rights violation and move to tibet. how does that benefit me as a boyfriend. what will i get out of it? once we learn to tell stories and illustrate what our partner gets, we make ourselves stand out from the crowd, because no one does that. >> if you are a smart woman. >> successful career women look better. >> where that leaves them is these are women in the 95th percentile - that leaves them 5% to date. >> is there a typical dating mistake, something that they are doing wrong? >> the biggest question women have about men. everything was great, what happened, where did it go wrong.

>> commonsense is turned into a lot of money. it's obvious that there are more than two options. >> he hosts a monthly conference call with 1,000 women online, paying $50 each to ask his men. >> it seems like my options are mice, bore or exciting jerk. >> all right, so let's say a guy says to you, "it seems like my only two options are the hot and crazy chick or the ugly smart chick, what do you say?", he charges his private clients, which number nine, $8,000 for a 12-week program. he writes their online profiles, has a professional take pictures, and becomes a sounding board, critic and advisor and stays busy. a private client halfway through the program is lena. she works in family therapy, and

ironically in couple's counselling. she began reading his blog and was hooked. >> i started online because there's no way for me to go traditio traditional ba because i can't grow up here and have no idea what i cas doing. if i had a date, i was walking in the darkness. >> what are you getting out of the $8,000. >> he pushed mean. i set up my profile before i talked to him. after he set up everything he went to the profile and said, "lena, why the height is 5, 8 to 6-1, what is the difference." he says i'll change it. guess what, after he changed that i went on a date with a tall guy and it was the first guy i liked. i think it's priceless to be happy, in love.

>> $8,000 is not a big number. >> one tip will shock you. >> perhaps catz's surprising advice, go for quantity over quality. catz went on 300 online dates. he says singles should lower starnds to meet more -- standard to meet more possible mates. >> what percentage of men are 6 feet tall. what percentage of men make $100,000 a year, has the same long-term values, want kids. so many things get in the way of a relationship. >> the advice is echoed by our own online dating experts. >> it's a numbers game. >> and practice. mind-set. >> you do. >> people want to find mr or mrs right right away. it doesn't happen. >> it doesn't happen that way. >> meet as many as you can in as little time as you can. >> as for evan catz, he found

his match in bridget. he didn't meet her online, he met her at a party. she was a year older than his maximum dating age criteria, and he was a different religion than she was looking for. >> is there a lesson to broaden your search. >> accidentally i stepped into it. she was nothing like what i was looking for, but i have the best time with her, and i can be my best self around her, and i was not constantly criticised or insecure and it was easy. i think my world was investigationships should be easy, if they are not easy, they are not right. >> that was a nice family and a lot of fun handling out with the group of la singles. coming up next - it's the fight for chicago. beyond the gunshots and fist fights chicago gangs are making a name for themselves online. the lyrical masters of the murder capital.

that's up next. >> don't miss the best of "talk to al jazeera" revealing... >> he said he was gonna fight for the public option, he didn't do it... >> shocking... >> forget the democrat party and forget the reublican party, they're all one party... the conversations people are talking about. >> talk to al jazera.

welcome back. pulling back the crime tape of 2013 now with some promising news. in many major cities violent crime dropped to levels that have not been seen since the 1960s. for example, in chicago, the number of murders dropped by almost 100, but the city is still ranked as the murder capital of the u.s., after closing 2013 with a death toll of at least 412 people. the most pervasive problem in chig is gang-related -- chicago is gang-related violence. is topic we have covered extensively. there's new comaberrations online -- collaborations online that may be fuelling the violence. . >> they're dead now. made. >> they're dead. >> all dead. >> they're dead, yes.

>> alven and his partner shorty are some of the most prolific producers in a hip hop music video seen. most artists produce drill music. that is main streamiac's preokayulation with success -- preoccupation with success, reiterating gang life. made? >> i'm thinking over 200. >> is most of your clients out of the clicks. >> most are - most rappers are gangsters in chicago. >> most of your clients are ganksters? >> yes. >> we are on the west side of chicago. we are with i.l.will, an up and coming rapper, he's performing

his music. >> i like to do three shots, and some zero shots. i might get a close shot, a far away shot. motion. >> the grind is artistic looking. if all that was put together nice with the song. it would be born. >> it's the drill music. >> outhentic. >> i.l.will and his crew call themselves the k-town gangsters, a click affiliated with a large street gang in chicago, the gangster disciples. it's not uncommon for clicks like i.l.will to shoot a video. they are popular online, receiving views in the millions. [ singing ]

>> into but they serve as a means for gang members to claim drug territory and issue threats to rivals. [ singing ] >> many of the music videos, like this from a click show members brandishing real guns and depicting execution-type killings. >> it's estimated that there are over 75 street gangs in chicago, with more than 200,000 well-armed members. over the last decade arrests of leaders led to a fracturing of gang members in the streets. no one is in charge any more. on the south and west side of the city, there can be warring clicks on every part of the block. in a story produced for "america

tonight." strayed. >> -- showed us the tools of their tray. >> smith and wesson, we have to do this to survive. survive? >> hell, yes. if it's to do with me surviving, hell, yes, i'll kill your arse. it's easy to get a gun. it's crazy. there's a million groups, everyone against everyone. >> where are we now. >> code mac. west side of chicago. we kick it. smoke, drink. this is a block. this is where we come together. >> how far away do you have to walk before you are in someone else's territory. >> pass the tracks. three blocks, you'll be in the mexican neighbourhood. >> would it be dangerous. >> they are waiting to catch or kill

someone, rob someone. when you walk there, it's me being smart, knowing that i shouldn't - i'm not superman. [ singing ] >> for almost every gang click there's a rapper like i.l.will, who is the public face, relating the block and taking on the rivals. >> recently on the internet - i say his name [ bleep ] i had a conversation. i seenize arse. he was talking crazy. >> see this, this is gd here. >> gangsters. >> they throwing it up. let's say this is a gang sign. if a person don't like you, they do this. >> so they take your gang side and put it upside down. look what he doing, he dropping

it. these guys are bds. >> black dissignles. >> yes. >> -- dissignles. >> what is the result. >> now someone see this video, they look for him. he disrespecting us. hits. >> yes. >> that's a lot. >> there were over 500 murders. if you guessed who percentage of that had to do with a feud that started on social media? >> i'd say 300. >> 300 out of 500. >> yes. >> it's because if up say something about me and everyone see you say something about me, it means us disrespected me. and i can't not let you get away with disrespecting me. you have to retaliate. it's sad. you really have nothing to live for in the neighbourhood, that means a lot for you. someone? >> yes, [ bleep ]. >> what

is that about? >> just doesn't know what he's getting into. when i see you on the streets, bang, bang. you. >> yes. we spoke to a known member of the gangster disciples, who identity. >> you have to defend yourself when you are put in a situation like this. >> you'd kill someone over this. >> yes. what are you supposed to do? >> so you got to kill that piece of cancer? >> yes. >> shortly after the interview he barely escaped being arrested by police for brandishing a gun in someone adds face and threatening to kill them. the next day he was picked up on assault charges. >> the most online profile involved the drill music and

inner scope records artist chief keith and lil jo jo. last year lil jo jo was affiliated with the gangster disciples made an internet mocking chief keith, associated with the black dissignles. there was a video made. that night lil jo jo talked to the crew and tweeted the corner he was standing on and tagged chief keith's crew. a few minutes later he was shot and killed in a drive by. he denies on involvement. someone from keith chief's twitter account mocked the murder and wrote it's sad because jo jo wanted to be like us. >> in the studio with ilwill and his crew, if they were not in

the booth they were on the smartphone phone sharing instagram. why does the shooting lead to more violence. lead to violence on the streets. >> makes them feel like superman. that's what we are called, internet gangsters. >> you sing about someone on facebook or twitter for all these people to see, even people that no nothing about you, he trying to three me out. he disrespect me for all these people to see. that. >> this is the problem here. this is why chicago so messed up. this is social media. this is what they use social media for. >> the ultimate disrespect is common and disturbing practice of video taping reprisals and posting them online.

a video called dj nate is blindsided by an a rival artist. nate is punched repeatedly. in a daze he's forced to give up the belt he's wearing. it was posted to the website worldstar-hip-hop. >> what is it. >> worldstar is hood news. this replace bet. this is the biggest urban site in the world. worldstarhiphop is the major catalyst for what we are seeing. stuff. >> it has 180,000 hits. >> everyone wants to feel like the man. the whole world wants to be a wrapper. used to be to get out of the hood you want to be a basketball player, now it's being a rapper. you don't have to have musical

skills or anything to be a rapper. people get straight out of gaol and they are good at the talking and they rap. >> out here the value of life is deteriorating. it doesn't have as much value. you see someone die, and people will laugh about it, "ha, ha, you got killed", it's like, "this person is not going to breathe any more." >> have you been involved in making a video where people were involved in bragging about killing people. >> a lot of people brag about people. >> at first i don't believe them, but the death poll is so truth. >> i'm on tv and all the social networks. some love my working some hate it. people talk smack about me, it's something i have to live and deal with. i don't go out and kill them.

>> you ain't in the same line of business we are in. you still get your pay check. >> you feel like your name is your livelihood. >> yes. >> is it worth losing your life. >> i ain't losing my life. he has to know how to protect himself. christo. >> looking ahead to monday, we return to fukushima, the never-ending nuclear nightmare. they are struggling to retain the disaster. we start the 4-part series. >> in the depths of japan's nuclear crisis, when each day's news predicts a darker day ahead, a small band of workers offered a ray of life. in a show of bravery employees faced daily doses of deadly radiation to bring the plant under control.

they were known as the fukushima 50. >> translation: the so-called fukushima 50 was a group of those who stayed behind during fukushima's darkest hour. >> in a care interview we spoke with a nuclear engineer, one of the few who volunteered to stay behind. >> translation: we felt we had a responsibility to put things right and we were probably the only ones that could deal with the situation. >> the courtroom of employees like this made them heroes. they are showcased as symbols of who the company is. another group of workers who put themselves at risk every day, to be fired when radiation levels get too high. >> the birds are contaminated, off the charts. >> a worker who we'll call

tanuka travelled japan as a labourer for most of his life. >> we used to wear charcoal filters, but because of cost cuts we had dust filters. filters. >> it sounds as if you say there workers. >> tepco is god. the main contractor are kings,

>> be know that parents are wired to love their children unconditionally, but for many families who have given the gift of adoption, it's a learning process, especially for children coming interest russian orphanages. those children grow up out of touch, sensitive, without a lot of affection. in the documentary the dark matter of love we meet the diaz family as we try to understand the pour of touch and the -- power of touch and the science behind love. >> we used to thing what the baby needed was being fed and it didn't matter who did it or how

many different people did it, as long as the baby was fed. this showed the basis of the relationship between the baby and parent is a thing called contact comfort. >> here are sectors. as you can see it was on a wire. watch. he'll stay. this baby stays more time on this.

is it not possible it's formed from a need for contact comfort? >> come and say hi. look at that. >> so they are looking for some pepper. pep per on the little boy. >> if it comes to a choice between wire and cloth it's reasonable to expect any child will go to the cloth. it's a matter of creature comfort. is this really love? well,

wouldn't you say that if you fightened the baby. it's comfort and then everything disappears and was replaced by a sense of security, that baby loved its mother. sure. all right. first thing the monkey sees is a symbol. just touching the cloth, holding on to her. gives them the confidence to examine the thing that terrified them so

completely. >> do you like the machine? it's making noise. let's go.

>> sara mckarthy joins us from australia. tell me about the diaz family. >> the diaz family are an extraordinary family that live in wisconsin in the usa. there's cloudio and cheryl and tammy. they go and adopt machar and an 11-year-old girl and two swin 5-year-old boys. six. >> the family assist open to you. invited them into your home. what was it like to be embedded with a famling like this. what were you looking for. what i don't recally drew me to the story of the diases, is the fact that they hired two developmental psychologists, what the scientists do is they try to help children who have never lived in a close family before, learn to love essentially for the first time

through a scientific intervention, and i just thought what a great question, can you learn to love through clients and what might you learn about the mechanics. one of the key insights i learnt over the course of interacting with the scientists through the making of the film is that humans can rewire their brains to live in close relationships much later than science originally thought. and it was extraordinary to be welcomed into a fam lick like the diazs with hope arms. my cameraman and i lived with the diazs on and off over the course of 18 months, and we became part of the family. >> let's talk about russia and american adoption of children. it's been a year now, as of january 1st, where they stopped happening. what is your family have to say about that? >>

so as soon as as we finished making the dark matter of love. there were 300 russian children like the kids in my film that met and bonded with american parents that haven't been ability complete the adoptions. as soon as i heard that adoptions stopped in the u.s., i thought of the moment that the main character in my film needs the diaz family and she's presented with a book of in is your new mum and dad and sister and dog and new house. and slept with that book under the pillow whilst waiting for the diazs to come back and picked her up. 300 are like her now. the orphanage carers are stealing the picture books away because they don't know what to say to them. i'm in touch with a lot of american personalities waiting

to bring their parents home, and they are one year on doing everything they can to give the children a chance at growing up in a family. because that's what we are designed to do. humans are designed through evolution to be raised in families, not institutions. >> that is heart breaking. >> sara mccarthy. the film airing on al jazeera. thank you so much for talking to us here today. >> pleasure. thank you so much for having me. >> it's looking incredible. al jazeera presents "the dark matter of love", airing sunday, america. >> ahead in the final segment, it's hidden in plain sight. you may walk under the a of greatness every day and never know about it. we'll learn about the storied architects. that's coming up

the stream is uniquely interactive television. we depend on you, >> you are one of the voices of this show. >> so join the conversation and make it your own. >> the stream. on al jazeera america and join the conversation online @ajamstream. consider this: the news of the day plus so much more.

>>

>> finally tonight we are opening your eyes to elaborate works that are all around you. some of the most impressive designers of american architecture. their tiling, volting graces us. their story has rarely been tomb. correspondent. >> the boston public library, new york's grand central terminal, the national history museum in washington d.c. these iconic buildings have a secret. but to discover what it is, you have to look up. these volted ceilings and domes were designed by a father and son team of maceons. their method sparked a revolution in architecture. >> it's almost as if they were dropped from the 14th century into early 20th century u.s. building some of the greatest buildings our country has known. >> it's an immigrant story of

the unnamed talented master craftsman who made our country and made our great buildings celebrated. >> in 1881, raphael and his son mying grated to the u.s. -- migrated to the u.s. from barcelona. >> the construction method was revolutionary in its day for three big reasons. it was fireproof. it was incredibly strong, and it could be built with no support from below during construction. almost like magic. >> we are between the outer dome and the inner dome. this is the part no one sees. look how thin the dome is, it's unbelievably thin. it's about 4 inches thick. >> wow. >> remarkably thin. >> largely forgotten by the spotlight.

>> these were drawn by the hand. >> an exhibition called palaces for the people. >> this is the construction of the auditorium. >> john is the curator. it's an impressive display of photographs, drawings and a scale model that appears to defy logic. the republica ceiling is a few inches thick, with no support from below. pounds. >> it's solid. >> the key is getting the gee i'm notary right, and they were masters at getting gee i'm not ris that were strong. so that was what they brought from the old world. >> the designs were not just strong, they were beautiful. few people have seen the master piece. the city hall subweigh station, hidden in downtown manhattan is referred to as the mona leesa of subway stagss. >> when it was opened it was called an underground cathedral.

it has skylights, shankeda leers and coloured tiles. it's been closed to the public for 60 years. it's a mystery space under the streets of new york. it's one of their masterpieces. >> at the height of popularity. the father and son duo had offices around the country. part of the success had to do with timing. >> many great cities were made buildings. >> in chicago in1871, 19,000 buildings burnt at once. if your city could go up with a match, there was a lot of interest in how can we find a way to make buildings that will not burn down. >> architects rely on the fireproof approach as they rebuilt cities. demand for work skyrocketed.

>> it was an architectural movement, it was inspired by past. >> styles changed. they faded into history. >> when that movement died out, and the sleek straight lines of out. >> the buildings stand, the name is virtually unknown. students at mit are hoping to change this. >> we are trying to document the works, raise awareness about them and try to help prevent down. >> i realise the buildings were all around me. >> to prove his points. john took me hunting around washington d.c. where are you taking me? >> to one of washington's oldest fire houses. example. >> this historic fire house

built in 1916 is a tourist attraction. this little example is, you know, a small xmp but shows how the work was valued for being fireproof and durable. before? >> no, definitely not. >> have you ever noticed it. >> i have noticed it, but i didn't know there was such a history behind it. >> it may not seem like it at the station. but more people are on the hunt for these sites. hidden in every nook and cranny. he created a map to keep track of the latest discoveries. >> how many do you estimate is out there. >> we are at 650 and climbing in about 40 states across the united states, and several countries as well.

>> here in the auditorium this is 80 feet across. a ceiling like this should not be possible. >> i expect to spend my life continuing to discover projects. it's exciting. >> sometimes it's easy to miss beauty, even if it's in front of your eyes. >> that is it for us here on "america tonight." remember, if you would like to comment on any of the stories you have seen, log on to the website aljazeera.com/"america tonight." you can meet the team, get sneak previews of what we are working on and tell us what you'd like to see on a nightly current affairs program. join the conversation on twitter. starting monday we return to ck

>> this is al jazeera america live from new york. i'm jonathan betz. >> gunfights in fallujah, car bombs in baghdad as iraq tries to push al qaeda militants out of key cities. >> a deep freeze - the midwest and north-east are bracing for dangerously cold temperatures. >> as peace talks begin, more violence forcing out thousands in south sudan. >> and the deadly health risk for beauty queens. [ ♪ music ]