this is "nightline." >> tonight, parkland strong. >> i have no idea what it's about to be like when we walk in. can't just go back to normal. >> we're with the shooting survivors as they bravely return to school, reliving those life-changing moments. >> he kept shooting. my best friend helena, it hit her. >> it was probably the scariest day of my life because i didn't know if i was going to make it out alive. >> parents and students healing together as two large retailers change the way they sell guns. plus the frozen kingdom. from the frosted edge of china, fantastical festival of ice and snow as big as a hundred football fields. bob woodruff with the craftsmen cutting ice block cubes for

building these outlandish designs. a one of a kind place on earth that's out of this world. but first, the "nightline" five. number one

good evening. thank you for joining us. today in florida it was a different kind of back to

school. students crossing a line of police, returning to marjory stoneman douglas high school full of nerves, frustration and sorrow. as they stepped into their new reality where everything has changed, 17 souls they cared about are gone. hard lessons learned. abc's victkctor okindo was ther >> going back to school in the normal way is not possible. going back to our normal ways for anybody that went through this will never be the same again. >> reporter: david hogg's morning routine is the only thing that will be normal today. >> members putting together a candlelight vigil. >> reporter: he's a core member of that student-led never again movement. >> we do have a major gun violence problem in this country. we need a multifaceted approach. this is a time for people to look in the mirror and realize there's a serious issue. >> reporter: his goal, to make sure a massacre like the one

that happened at his school two weeks ago never happens again. but this morning the 17-year-old is laser focused on just getting to school. >> by no stretch a typical day when you have to take your kids back to school after a shooting. >> reporter: in a few hours david and his freshman sister lauren will confront a new reality. >> lauren keeps saying i don't want to do this. and i keep saying we have to get through this. we don't have a choice. we're all going to school. >> i can't lock the back door. >> i'm like scared but also i'm kind of happy because i'm going to get to see some of my friends that i haven't seen in a while. >> it also kind of sucks, normally when we go to school, when i turn in, i see coach feis. he's not there today. and he won't be any other. >> coach feis would wave and smile at literally every person that walked in.

that will be tough for a lot of people. >> reporter: tough doesn't even begin to describe it for senior sam zeit and his younger brother matthew. they both were in the building where the shooting took place and barely managed to escape. >> i have no idea what it's about to be like when we walk in. because you can't just go -- we can't go back to normal. >> reporter: last week sam was at the white house making an emotional plea to the president. >> i don't understand why i can still go in a store and buy a weapon of war, an ar. i was reading today that a person 20 years old walked into a store and bought an ar-15 in five minutes with an expired i.d. how it is that easy? so let's be strong for the fallen who don't have a voice to speak any more.

and let's never let this happen again. please. please. i don't think we're going to be doing academic at all because we're not bringing our backpacks. thank you. >> have a good day. >> thank you. you too. >> reporter: at stoneman douglas today, a sea of police officers on site to welcome the students. >> why do you think they're here? >> so people feel safe. >> reporter: but for some of these kids and their families, the memories of the shooting still raw. >> i'm about to scream in rage, like it's hitting me. >> reporter: just two weeks ago -- >> there's an active shooter situation in south that. reports are just coming in, but we don't have a lot of information. >> i was in my ap environmental science class when first gunshot echoed through the hallways. >> i hear at least nine

gunshots. it was just one after the other after the other. >> you ran to get out of the line of shot as quick as we could. >> probably the scariest day of my life. >> i took a book up and held it up like this. and i was holding it. it was just a defensive measure. it helped me feel a little better like i was safer. he kept shooting through the rectangular window. it hit two people who were near to me, one of my best friends, helena, it hit her. >> we ran out of there with our hands up running for our own lives. >> i found out later that day that 17 lives were lost. >> reporter: the principal hoping the students' return to school today can be a day of healing, tweeting that his focus today is on emotional readiness and comfort, not curriculum. the students' first stop, their fourth period class, the same period they were in when the shooting began. the idea, to allow them to spend time with those students they were with when the shots rang out. >> when i got into the classroom, it was kind of like everyone stared at each other

and it got silent, then we reunited. >> reporter: teachers employing the help of therapy dogs. the freshman building where the attack occurred closed and it will never be used again. >> today was a weird, strange, emotional day. >> reporter: how so? >> in my spanish class especially because one of our students didn't show up today because he was one of the 17. so that was very upsetting. >> reporter: another one of the students who wasn't at school today t 18-year-old meadow po pollek. >> she was my baby, my princess, everything. >> reporter: last week andrew pollek's pain and anger evident at a listening session at the white house. his two sons beside him. >> we're here because my daughter has no voice. she was murdered last week and she was taken from us. shot nine times on the third floor. all the school shootings, it doesn't make sense. fix it. it should have been one school

shooting, and we should have fixed it! and i'm pissed because my daughter i'm not going to see again. >> i was giving it to the president. it was everybody as a nation. that's what i was saying. how can this happen? my son's friend put this together. >> reporter: he's channelling his grief into action. >> i have the heart of a lion here. nobody could stop me. nobody. we have the opportunity to be in this country and be proactive and fix it. that's about what meadows movement is. >> reporter: he's skeptical that any federal gun control legislation will pass. >> tomorrow i'm going to the white house and i don't really even know why. >> reporter: though he does remain hopeful that some measures proposed by rick scott will be successful. >> we have to get something done. we have no -- there's no alternatives. >> the bill is very important for school safety, for mental

illness and for the meese. friday and saturday i'm going to be back in tallahassee at the state capital meeting with people who will decide whether this bill is passed or not. >> to think about the loss and the grief that those kids and the parents had, we said we need to do something. and we're taking all of these guns out of all of our stores permanently. >> reporter: today dick's sporting goods announcing that his stores would no longer sell automatic weapons. they'll no longer sell high capacity magazines. >> we're staunch supporters of the second amendment. i'm a gun owner myself. but we've just decided that, based on what's happened and with these guns, we don't want to be a part of this story. >> reporter: now walmart also raising the age restriction to 21 for firearms and ammunition as well. back at stoneman douglas a remarkable 95% of the student body brave enough to come back to school today. and after they finished their day, a small sigh of relief.

>> we're just like comforting each other, talking to each other. we hugged most of our teachers if not all of them. they gave us speeches about how they're here for us. >> reporter: so what the principal said, this is about the healing process, he meant it. >> we come first. >> reporter: reporting from parkland, florida. our thanks to victor. next, 10,000 workers built this frozen kingdom every year. bob woodruff takes us inside a real winter wonderland. ♪ life goes on, yes, life goes on... ♪ i've always wanted to share a special moment with my mom. i think surprising her with a night ski trip would just be the biggest gift i could give her. let's make that happen. she's gonna be so excited. ♪ take me where i want to be. ♪

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every year more than a million visitors gather at the northern edge of china to visit a gigantic amusement park made of ice and snow. now, thanks to abc's bob woodruff, you can see it from your couch. think of it as cubetube. >> reporter: the frozen imaginestry of the ice festival. more than 50 years this ethereal ice has drawn visitors to china. we're here to see how all of this is done. look at this place. this is harbin, china. the average temperature in winter, 11 degrees below zero fahrenheit. i am a lousy negotiator. this is the city of ice. everywhere. so here's downtown harbin with

the park made out of ice. the building blocks come from here. by december, the river flowing through the city completely freezes over. it's like diamonds of ice. the men and women of harbin literally carve the blocks of ice from the river. come on, pay me. i just worked. this woman run the ice carving business started by her father. today she's on deadline.

going to drink beer? >> he has a team of about 100 workers. each day they rise before 4:00 a.m. cutting and hauling up to 1,000 blocks until sunset. here it's still grueling physical trade. push aside the snow, cut the frozen river into a grid, then huge blocks. each of these blocks weigh at least 2,000 pounds. so you have a 19-year-old son. do you think he'll work here, too? u.s. army. this man has been doing this for 20 years.

has anybody ever been injured doing this? but as we saw, even one slight slip by these veterans can be dangero dangerous. here the worker's foot gets caught briefly under the block and just like this his toe is broken, an injury that takes him off the job. other workers have fallen into the water, but we're told no one has been killed. trucks then deliver the ice into storage. no further refrigeration required. here in the backyard of the festival, they wait to be turned into pieces of art. i don't know how long it takes them, but they put each one of these castles together, palace, block by block from the festival is

like a frozen city. when the sun goes down the ice city really comes alive. ow! oh, my god. the ice lit up by l.e.d. lights can be of any shape and any color. the size of 100 football fields, theharbin ice and snow world is a winter wonderland. i got my big hat. because i have no hair.

>> reporter: so is this the same hat that you wear in boston. >> no, they would be laughing at me. the architect who designed it all -- how long does it take you to build all of this? >> less than two weeks. >> reporter: you build all of this in less than two weeks? this year's theme is rather politically appropriate for china. that belt and road initiative is one of president xi jinping's

most important projects, to build roads and train tracks all around the world, to step up his country's trade. as the temperatures here rise, all of these buildings and sculptures will melt back into the ground. less than a year from now, the river will freeze as it always has so the workers can cut again. for "nightline," i'm bob woodruff in harbin, china. >> can hardly wait to see what they do next year. you can see reports from bob woodruff at abc.com/features. next, send in the clones. how barbra streisand says she created two very familispecial s from a familiar face. ♪ of the way we were ts provide the same omega-3 power.

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streisand telling the world she's created her own walking dead. >> this is robin, sammy. >> calling her late dog samantha to make miss violet and miss scarlet pictured with their distant cousin miss fanny. but make no mistake this doggy duo cost some major bones. a pet project like this one could run, get this, $50,000 to $100,000. ♪ don't rain on my parade >> but babs wants a puppy party, don't rain on her parade. ♪ rain on my parade >> it was american humorist kinky friedman who says, money can buy you a fine dog but only love can make him wag his tail. thank you for watching "nightline." and as always, we're online on our "nightline" facebook page. thanks for the company, america. good night. good night.

>> from caesar's entertainment studios, it's happy couples week. today our couples are all newly engaged and ready to take that next step, working together to win $1 million on national television. so what are we waiting for? let's play "who wants to be a millionaire." [dramatic music] ♪ hey, welcome to "millionaire." it's happy couples week.

are you guys ready for love and money? [cheers and applause] >> very. >> bringing my two passions together: love and money. from los angeles, california, please welcome back nicole and mark, our happy couple. >> good to be back. >> happy because in a month from now, you're gonna be walking down the aisle. >> both: yes. >> and you're walking up our board to $10,000. that's where you are right now. you've already made $10,000. you're over, what, 7 questions away from $1 million, and you still have 2 lifelines, the "50/50" and "plus one," on the board. and by the way, since it's happy couples week, every time one of our happy couples successfully answers the $5,000 question, they not only get that money, they also get the special prize. on the last show, you two won free tickets to see celine dion at the colosseum at caesars palace. well, on today's show, players who correctly answer that $5,000 question, they will get this, a cabana at the garden of the gods pool oasis at caesars palace.