[ cheers and applause ] instagram and the great divide. the price of the perfect pictures trampling precious poppies and toppling historic trees, all for that selfie. business is booming but so is concern. will the pursuit of the perfect post ruin our national treasures? plus, show of love. when a pretty woman will say anything for love actually, it's as good as it gets. celebrating all our favorite romantic comedy movies. >> welcome to rom com fest. >> and the new coming of age for feel-good flicks, raising a

glass to all the boys and girls we've loved before. and record breaker. what do "despacito" and "one sweet day" have in common? we'll find out. but first the "nightline" 5. . number 1 in just 60 seconds.

good evening and thanks so much for joining us. it's certainly hard not to want to snap a picture of that beautiful sunset or pristine landscape.

especially when it's inside our national parks. but what of our collective search for the perfect post for the gram is endangering the very places we want to photograph? here's abc's maggie rulli. ♪ >> reporter: they're some of the most awe-inspiring natural wonders in the country. >> oh, wow. oh, man! look at that. >> reporter: horseshoe bend, the grand canyon. zion national park. and the wave. >> omg we're about to enter the wave, and it looks so freaking cool already. >> i saw some pictures from the instagram. so we decided to come to here for our summer vacation. >> reporter: these stunning backdrops lure millions of visitors with the promise of a perfect post. >> people are just taking selfies and not really enjoying where they're at. it's kind of like oh, i got my selfie, let's go home now.

>> reporter: it's a social media goldmine. but for some locations insta popularity proving to be too much of a good thing. >> social media has focused so much attention on particular places that they really are at risk of being loved to death. >> reporter: with throngs of visitors causing irreparable damage during the recent california poppy blooms and at joshua tree national park, some of our public lands are now threatened by overcrowding. we set out to see how these national treasures are doing with crowds being driven in part by social media. horseshoe bend was once a little-known spot in arizona where locals would hang out to catch the sunset. but almost overnight an overlook that once saw 4,000 visitors a year began seeing 2.2 million visitors a year. that's over 4,000 visitors a day. >> 2015 was when it really exploded. >> that's also when we saw this huge rise in social media,

especially instagram. >> i think it's a huge contributor. we provided the railing so people can take that safe selfie. >> reporter: that new railing part of a larger effort to manage the explosion in crowds which were causing trash build-up and safety concerns. >> and how important is that, keeping up with the infrastructure? >> well, if we didn't invest in the park we would see a lot of resource damage. when you add 2 million visitors to a place like horseshoe bend, you have to manage human waste and trash. >> we just saw page, arizona, a place dealing with this onslaught of tourism. now we're heading to the grand canyon, a place that knows tourism really well. we're going to check out the north rim, which people tell us is supposed to be a little bit quieter. holy smokes. >> welcome to the grand canyon. oh, my god, i love it. >> reporter: jerry ginsberg has spent the last 30 years photographing every single national park and many of our public lands. >> one thing that makes me very

sad is to see canyons and forests and trees that were formerly very pristine just completely destroyed and with a greater influx of people it creates more wear and tear and eventually given enough time they'll lose their scenic attractiveness. >> reporter: for young and upcoming photographers many of them use instagram as their medium, so why shouldn't they be given their chance to get instagram photos at the same places where you were able to take your photos 20, 25 years ago? >> i hope they are. i hope they can and do that and give them fresh interpretations. they may have to go out on their own and find new and different places to create original images. >> reporter: right across from the south rim of the grand canyon, one of the busiest portions of this national park, here we are at the north rim and it's almost complete solitude. >> went to horseshoe bend the day before yesterday. >> reporter: that's where we met chad roso, who had just come from visiting horseshoe bend.

>> what made us go there was the whole instagram blowup. this is a whole different experience. >> reporter: how would you compare the two, horseshoe bend versus north rim? >> this is like you said solitude and that's a zoo. >> reporter: and yet just 2 1/2 hours and one state away zion national park, only 15 miles in diameter, attracts 4.5 million visitors a year. that's nearly 2 million more visitors than yellowstone receives at a fraction of the size. >> we're definitely having issues keeping up. >> reporter: ali baltrus has been with the national park service for nearly 30 years. >> we'll get you on the next one. >> back in 2012 we had really no lines. so if you had told me that i was going to be running a shuttle line and have people staffing the shuttle line in order to board shuttles i would have laughed. we started seeing more crowding around 2013 and it kept going up from there. >> reporter: it's morning and this line is still hundreds of people deep. the park ranger told us it starts about 5:45 a.m. and it stays this way all the way through 2:00 in the afternoon.

>> reporter: despite the lines, the shuttles and the heat, everyone we met said they were having a great time. especially at the narrows. a breathtaking river hike that's one of zion's most popular attractions. >> you can still enjoy it even though it's kind of crowded? >> you just go around them, try to enjoy your time, don't let them get in your way. >> reporter: but not every instafamous location is open to zion-sized crowds. we're about to enter the lottery to see if we get to hike the wave, but we were told we'd probably have a better chance of winning mega millions. >> reporter: every year more than 150,000 people apply to visit the wave, a rock formation on the arizona-utah border. but just under 10,000 are selected. with only 20 visitors per day, the wave is one of the most restricted public lands in the u.s. >> 9:00 we will draw for 10 selected spots.

>> reporter: inside we meet paul laboulet, a german tourist who's applied five times. >> it just looks so cool. i want to do it. >> reporter: when did you first see a picture of the wave? >> probably on the windows screen saver. >> reporter: that windows desktop picture made the wave one of the first ever viral destinations. >> the wave has been featured on social media. we're seeing really a dramatic increase in the number of people that want to come out and visit. >> reporter: mike herder works with the bureau of land management. he says the agency's considering opening up the wave for up to 96 permit holders per day in part due to high demand. >> that's more than 400% the amount of people we're letting in now. >> what we're doing with the wave really is doing a environmental assessment. can we in fact increase the number without tipping that balance where solitude is lost? and it just becomes a line of people that are coming through this spot. >> reporter: so what are the dangers of this? >> potentially spoiling a

beautiful place. it would be very challenging to put 96 people into the wave because it's a relatively small feature. >> reporter: tara mckinnon from the center of biological diversity worries that the feature is already endangered at current use levels. >> it's an american right to enjoy public lands, but it's also our obligation to ensure that we're not ruining these places, these very fine delicate sandstone structures. even under the current use levels we're seeing impacts that the b.o.m. never anticipated. >> reporter: while exploring the trail head near the entrance to the wave taylor showed us one of the reasons why this area is so protected. >> here's a great example of a soil crust. it's actually alive when it rains. that crust allows the moisture to actually absorb. and it's very sensitive to ast. and here you can see where old footprints -- >> look at that right there. >> these old footprints have destroyed it. >> i'm not going to lie.

this kind of looks just like a block of mud. >> it does look like a block of mud. >> you're saying this is important? >> the soil crust aesthetic unfortunately doesn't nearly match its ecological importance out here. >> reporter: our chance to further explore this delicate ecosystem rests in this bingo cage. >> all right. first lucky person is number 10. do you want it? it's number 11. >> what did you think when they called your number? >> excited. >> yeah? >> reporter: 4:00 a.m. wake-up call. we are up and ready, heading to hike the wave. we set out just as the sun was rising over the desert. with cory unsworth who's been leading tours to the wave for five years. >> we are currently in utah headed toward the wave. >> reporter: and when we finally arrived -- >> this is the first thing they see.

>> reporter: -- it did not disappoint. >> is it everything you thought it was going to be? >> gorgeous. >> reporter: for cory it's all about striking that delicate balance between nature and those who are seeking to bask in all of its glory. >> you're a tour guide. your company would benefit if they opened up more tours to the wave. yet you still don't want more people in here. >> no. i do this because i love it. this is one of those spots you don't yet have that overcrowding sensation. so it's nice we still have a few place as round we can go and still have a unique experience on our own. >> reporter: for "nightline" i'm maggie rulli on the arizona-utah border. and up next, falling in love with "pretty woman." celebrating some of hollywood's most memorable fairy tales. celebrating some of hollywood's most memorable fairy tales. with moderate to severe ulcerative colitis, are you okay? even when i was there, i never knew when my symptoms would keep us apart.

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they are the movies we love to love. romantic comedies. they're cute, funny. okay, sometimes cheesy. now as rom coms are moving into a new modern chapter fans are getting a chance to show their true love with the classics. who can forget the moment richard gere snaps down that jewelry box in "pretty woman"? >> oh! >> reporter: or aunt vula in "my big fat greek wedding." >> he doesn't eat meat. >> you don't eat no meat? >> reporter: iconic moments from some of hollywood's most beloved films. and lately a movement has been afoot to give them their due. take katz deli in new york city. >> oh! oh! >> reporter: recently inviting people to relive the "when harry met sally" scene. >> i'll have what she's having.

>> reporter: with an "i'll have what she's having" contest, seen here on tmz. >> yes! yes! >> oh! oh! >> reporter: and here in los angeles -- >> welcome to rom com fest. >> reporter: the first ever rom com fest. a gathering to celebrate romantic comedies and all they represent. from rainy day movie treats to a photo op for you and your besties. and special screenings of some teenage classics. >> this is my dream festival. it's romantic comedies and dessert. >> the world is so full of chaos that you kind of need a place where you can be kind of happy and gentle. >> it's not just you walk in, watch a movie and leave and go back to the harsh reality of the streets of los angeles. >> reporter: miraya berke is the 29-year-old founder behind this labor of love. >> i wanted to create these environments that really spark joy and celebrate love i think

is so important right now. >> reporter: one of the guests of honor, actor, writer and creator rachel bloom. ♪ i'm just a girl in love of musical dramedy "crazy ex-girlfriend." >> i think that it's cool that the rom com is getting venerated in this way because for so long you had this term "chick flick." and what that connotes is any movie geared toward women is lesser than. >> reporter: in the '90s romantic comedies introduced us to beloved on-screen couples like meg ryan and tom hanks. >> she's beautiful but she's a pill. >> reporter: leaving us sleeplessly yearning for more. so we got mail. >> i have a terrible cold. >> reporter: rom coms were clearly having their moment but in the 2000s it was harder to get these feel-good films made on the big screen. >> a lot of studios hadn't figured out how to make a romantic comedy that worked as a

film and made sense for them financially. >> reporter: on the big screen "crazy rich asians" dominated the box office last year with a whopping $238 million globally. and streaming services like netflix investing in romantic comedies like the wildly popular "to all the boys i've loved before." >> here's the thing. i had to make it look like i liked you so somebody else wouldn't think i liked them. >> reporter: producer matt kaplan and his team are working on the film's sequel. >> "to all the boys i've loved before" has been seen by over 100 million households. which is just crazy. >> reporter: "to all the boys" was the film screen adaptation of a popular young adult novel of the same name. >> stories about love and identity and family are always going to want to be told. i think now we have specific audiences like "to all the boys i loved before" where you can focus on a korean-american family is something truly special that traditional studios weren't willing to bet on. >> reporter: with the emergence of streaming services like hulu and netflix it's easier than ever to watch from the comfort

of your home. >> who doesn't want stuff on demand? theatricals are a great experience but the average 20-something or teenager doesn't have the financial situation to just be able to go drop $15 to $40 on a friday night. >> reporter: the resurgence of rom coms now making room for a new generation of writers and talent. katie silberman wrote "set it up" starring lucy liu. >> this is how it always starts in my nightmare. >> what are you doing? >> what is he doing? >> reporter: shopping her script to studios around town before ultimately finding it a home at netflix. >> it felt like everybody was coming out of the woodwork to admit this was a genre they missed and they loved at the time. and then netflix ended up being i think the perfect place for it. >> reporter: recently she and olivia wilde teamed up on "booksmart" which was released on the big screen in theaters nationwide. >> it is very important you keep this safe. >> reporter: olivia wilde tweeted at the time saying "we are getting creamed by the big dogs out there and need your support. don't give studios an excuse not to greenlight movies made by and

about women." wilde, acknowledging the challenge of getting female storylines greenlit and also filling theaters. >> i think there's room for both the theater experience and streaming. i'm still excited to watch hulu's new "four weddings and a funeral" which is amazing. but i also am so excited to go to the theater and see a romantic comedy. >> reporter: returning us to a place where love conquers all. we're back at rom com fest, where fans say the genre's never left. >> i think we relate to those themes in the modern day where a lot of chaos can be going on but you can sit at home and watch "to all the boys i loved before" and be like the world is beautiful. >> one of her favorite romcoms "never been kissed" before a delighted audience. >> they're fun. you get to laugh and be with aneverody really enjoys it. >> the creator of romcom fest says she hopes to expand the event next year.

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finally, riding the old town road to victory. ♪ i'm gonna take my horse to the old town road ♪ ♪ i'm gonna ride till i can't no more ♪ lil' nas x is hitting the bullseye. the hot new artist's viral sensation "old town road" is now the longest leading number one hit to top the billboard hot 100 ever, dominating first place for an unprecedented 17 weeks. toppling the previous 16-week title holders, "despacito." ♪ despacito ♪ and mariah carey and boyz ii men's "one sweet day." ♪ one sweet day mariah symbolically handing the torch to lil' nas x in an instagram post. "a rising star has rewritten what it means to be country." releasing an extended play of old town road and coming out as a gay man.

and the artist says he's just getting started. >> this is only the beginning. and people won't realize that until they realize it. >> that's "nightline" for tonight. you can always catch our full episodes on hulu. good night, america. good night, america.