?this is "nightline". tonight, the voluntourist trap. traveling halfway around the world, donating your time and your money to a children's orphanage, only to discover it's the exact opposite of the safe haven you thought. >> the conditions were so poor. >> businesses built to break your heart and your bank. >> were the children told to tell the white people they were orphans? >> yes. >> yes? >> we're on the case. tracking down one of the men who profited from the dark side of summer vacation. >> did you ever abuse kids? >> no. they'd get a snow cone. >> plus, going gold. the u.s. women's gymnastics team takes the gold. led by a 19-year-old girl who has the gymnastics world flipping out.

history, simone biles has already raised the bar. what does it take to become such a sensation? rocking the boat. >> that's right. >> what's got dwayne "the rock" johnson fast and furious with some of his male co-stars? a ringside view of his explosive social media smackdown. first the "nightline 5." >> hey, guys. what's up? >> the new recipe of beneful is excellent. the first ingredient is chicken. >> this clicken is spectacular. >> i had to hide the bag, he would try to put his facin you love it, don't you? you love it so much. i feel when he eats beneful he turns into a puppy again. it's proteins, vegetables, grains, sounds like a dinner i'd make for myself. >> it's a big bag, have some of mine. try new beneful. >> now with real chicken as the number one ingredient. healthful, flavorful beneful.

good evening. thank you for joining us. it's a growing trend in travel, voluntourism, do-gooders hoping to see the world while supporting a worthy cause. but things are not always what they seem. tonight, a shocking investigation into suspect orphanages in nepal. here's abc chief foreign correspondent terry moran. >> reporter: welcome to kathmandu, a mecca for mountain climbers and spiritual seekers alike. it is also a major hub for travelers who are lured by the opportunity to give something back, so-called voluntourists. >> hello. >> reporter: nepal's orphanages attracted voluntourists from around the world, part of a booming billion-dollar voluntourist industry, popular

>> it all sounded really positive. as a schoolteacher i was interested in volunteering. >> reporter: moira waterfall was 29 when she took a trekking vacation in nepal. she heard about an orphanage called happy home from fellow hikers. moira decided to teach english there. she made her own fund-raising website to help the orphanage raise money from outside donors. and the man who ran the off fan -- orphanage is seen here in this video then one day a shocking encounter changed everything. >> i was just going for a jog. i ran into one of the children that were in the orphanage and she was with a woman who was old enough to be her mother. aunty, they call you aunty. she said, he's a bad man, trying to explain to me what happened, really upset, in broken english. i didn't understand, i didn't know who this woman was with her. to my knowledge, the majority of these children were orphans. >> reporter: on happy home's

but she told moira this was her mother. >> she started explaining to me the man was stealing their stuff, that he was physically abusing them. >> reporter: word spread among the volunteers who helped bring a case him. he was found guilty of severe child neglect. >> nobody wants to believe when you put time and energy and love and money into something you think is good, that it may not be. it's a horrible, shocking feeling. >> moira had personally raised $4,000 for happy home and says she knows her fellow volunteers raised tens of thousands more. while there are some legitimate orphanages in nepal, experts here warn that too often voluntourism fees end up going into the orphanage owner's pockets. more often than not, the kids aren't actually orphans at all. >> they get volunteers to come, they create websites. of course, you know, the foreigner's heart is just broken and they just give and give and give. >> reporter: this is anna howell and martin punax, working for american ngo next generation

they work with the nepali government to rescue children from orphanages and bring them to this transit home. every child here was rescued from an orphanage. >> well-meaning foreigners are funding -- >> exactly. >> -- a trafficking regime? >> yeah. >> reporter: here's how it works. orphanages in nepal can get thousands of dollars of dollars in donations from foreigners. but they need children to get this money. so they send agents into rural villages to convince poor parents to send their kids to >> in these remote villages, desperate poverty. a trafficker shows up. what's the pitch? >> it could be someone that's got high status, dressed well, promises sponsorship, boarding school, health care. >> the parents turn the children over to the trafficker? >> they see this as a way of helping their children to have a better life. but all these promises are false.

to sushila, rushila, and sudib, three young siblings from a small village three hours outside kathmandu. the organization says the three children were rescued from a neglectful orphanage in a raid that was actually broadcast on local tv. >> was it a bad place? how was it bad? >> reporter: they say they were beaten. >> hit the bottom of your foot? >> reporter: the kids tell us they were underfed, had tuberculosis. >> were the children told to tell the white people they were orphans? >> yes. >> you were supposed to tell them no mom, no dad, you were orphans? >> yes. >> reporter: unicef estimates 85% of children in orphanages in nepal have at least one living parent. the child welfare board keeping tabs on orphanages is like a game of whack a mole.

devastating earthquake that struck just last year, creating more chaos that human rights groups warn could lead to more orphanage trafficking. we noticed that the website for happy home was still being updated. could they still be open for business? ? ? home ? >> reporter: my producer went in posing as a potential volunteer. ? happy home ? >> reporter: turns out this man has nearly 100 children in his care. >> the or day you were telling -- >> when our producer asked him about the abuse conviction, he blamed it on western attacks. >> could you explain what you mean by that? >> i was in jail also. >> for what? what were you in prison for? what were you in prison for? >> kidnap. >> kidnapping? >> yes. >> reporter: in addition to the conviction for severe child

kidnapping and fraud, charges which were ultimately dismissed. >> how do you explain the fact that you have 100 kids in your house, but you have these charges and fines you're paying for child abuse? how do you explain that? >> actually, happy home is -- already we spent more than ten years here. and the case was just one and a half year past. so it might not be true. >> did you ever abuse kids? >> no. there is no proof. it's just propaganda. >> reporter: he says he's appealing the court decision. when the government does rescue kids they often hand them over to next generation nepal, who work to reunite them with their families. >> you guys are going home, how does it feel? >> reporter: the siblings are hopeful this is the end of their ordeal.

? >> reporter: the children's mother and grandmother say they sent them to an orphanage in kathmandu in the hopes of an english education. they were devastated to find out the children were not being cared for. >> are we close to home? >> yeah. >> reporter: today they're being welcomed home by their grandmother. >> hi, sweetie! >> reporter: a moment years in the making. >> your grandchildren are home now.

>> reporter: according to martin, finding children's families can be like finding a needle in a haystack, but the end result is worth it. >> it's wonderful seeing them here now in their village with their grandmother. >> reporter: a happy day for the siblings. but there are many more children like them still waiting to go home. >> you really want people to come to nepal, volunteering in an orphanage is not good. most of them are scams, they're not real orphanages. >> reporter: for "nightline," i'm terry moran in kathmandu, nepal. up next, u.s. women's gymnastics team sticks the landing in rio with the help of 19-year-old superstar simone biles. later, why is dwayne "the rock" johnson throwing stones at rock" johnson throwing stones at some of his costars? captions paid for by abc, inc.

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protecting you, and the dreams you pursue, today. insure carefully, dream fearlessly. at 19, she's at the top of her sport. she already has her own signature move, one few others dare even to attempt. she's favored to win several she scored with her teammates. we're with simone biles as she prepared for her dazzling olympic debut. here's abc's matt gutman. >> we are the final five! >> reporter: tonight the final five taking home the gold. the women's u.s. gyp nas ticks team flipping, tumbling, and vaulting to olympic glory. they were prohibitive favorites but the moment was sweet as the 2012 london games veteran aly

side. the human spring sealing it with a nearly flawless floor routine. her teammates surrounding her, raisman planting a tender kiss on her forehead. biles is said to be perhaps the best gymnast all-time. the smallest woman on the u.s. team at 4'8". she hasn't lost a competition in three years. so talented, in fact, she even has a move named after her. the biles. amy boorman is >> she flips backward with a straight body two times on a second flip she does a half-turn and lands forward. >> reporter: in 2012 simone was too young to compete in the london games. but since then she's been on fire. >> sometimes i hear the crowd cheering. and most of the time like your body's on auto pilot so

floor trin, i'm like, did i really just do that? >> reporter: the 19-year-old gymnast is a three-time world all-around champion. the first woman to win the title three times in a row. she's earned 14 medals in the world championships, 10 of which are gold. "nightline" sat down with her before the u.s. olympic team trials to find out what it takes to make gymnastics history. >> on mondays and wednesdays i train 12:30 to 5:30. tuesday, thursday, friday, i train 9:00 to 12:00, then 3:00 to 6:00. saturday we practice 9:00 to 1:00. >> reporter: the fierce work et the admiration of legendary coaches. today she is the best gymnast in the world. >> reporter: bela karolyi who's coached nine olympic champions including the greats like nadia says simone compares to the very best in olympic gymnastics history. >> back at that time it was considered perfection. absolute perfection. mary lou in her time was

now simone's time is coming up. >> reporter: to get a spot on the podium, as 1976 gold medalist nadia comanec knows, you've got to bring it when it counts. it's not only how good you are technically in gymnastics. how good you are here too. to put your best routine when the judges do this. >> reporter: pressure that simone's mom nelly biles says she's feeling herself. >> i think simone tries hard not to p a the expectation is of others. i believe there's more pressure on me than on simone because i am so nervous. i mean, i am just a wreck. >> reporter: she says simone was like a spring from the time she was a little girl. >> if i would describe simone, always jumping. always flipping. i don't think simone ever walked up the stairs. >> reporter: discovering gymnastics was an accident that happened after a field trip was canceled.

instead and ended up going to bannon's gymnastics. i still recall simone coming home with a note saying, would we consider her joining the gym? >> reporter: simone's biological grandparents adopted her from foster care at age 5. with their unwavering support, simone sprouted. >> they as you travel to my meets and do whatever i need. i'm really grateful for that. i think every time i go and compete they're so excited whenever i do well, because they know how hard i've put in. >> reporter: her coach, amy boorman, remembers the moment she saw her the first time at age 6. >> i was like, what is with this kid? she did a roundoff backhand spring her very first time in class, and she said my brother taught it to me in the backyard. >> reporter: it's those handsprings that set her apart, says her coach. >> knowing exactly where you are in the air. some people have incredible balance, imagine having balance without your feet on the ground

knowing exactly when to bring your feet down to the floor so that you don't die. >> reporter: it's that grit that smile, and all those medals that have caught the attention of corporate sponsors. household names like procter & gamble's tide pods. >> it's small but mighty. i think i paired up with them because it reflects on my gymnastics. >> she knows small can be powerful. >> reporter: before the commercials and fame there was sacrifice, lots of it. all those countless hours gym for thing her to miss out on moments most teenagers cherish. >> i thought that like i was missing out on public school and going to all the football games or prom or homecoming. but then once i think back to it i'm like, well, yeah, i can say i've missed a prom but i've been to three world championships and they won't ever get to say that. so i think it's a win-win. >> split and wrap. good. she's a major rock star. when you have people like mary lou retton and bela karolyi saying she's probably the

seen in their lives, that's a really big deal. >> reporter: tonight she's one step closer to proving that's the case. she's favored to win four more medals in the individual events. >> i guess what's on the line for her is it would solidify her as the best ever. >> reporter: in fact, she's just two medals away from becoming the most-decorated american gymnast of all-time. >> you kind of feel everything, like all your hard work put into that one moment, and then especially like with the t you all get to share that memory together and it's something you can remember forever. >> reporter: for "nightline," i'm matt gutman in rio. and next, strong words from a strong man. what "the rock" had to say about some of his "fast and furious" costars. abc news nightline, brought to you by pfizer. i'm billy, and i quit smoking with chantix. i decided to take chantix

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finally tonight, whatever "the rock" is cooking has reached its boiling point.

tonight about some of his "fast 8" co-stars. the "fast and furious" stars are known for high-speed chases. >> right? >> that's right. >> and action-packed drama. but for dwayne "the rock" johnson, the real drama seems to be behind the scenes. the "fast 8" actor furious with some of his male costars, taking to instagram calling them candy -- you fill in the rest. the posts going viral with more than 3 million views. "the rock" didn't stop there. this time around he's promising a very authentic performance. when you watch this movie next april and it seems like i'm not acting in some of these scenes and my blood is legit boiling, you're right." >> smell what the rock is cooking! >> apparently he's cooking beef.