6 great moments from GMA 40 for 40

NEW YORK -- Good Morning America marked its 40th anniversary celebration with a marathon 40 hour live streaming event.

In one of the big moments from GMA's 40 for 40, One Direction took the stage to mark the monumental milestone with a show that brought the house down in Los Angeles. The band, which just finished touring Great Britain and Ireland, opened with "Drag Me Down."



GMA 40 for 40 went behind the scenes as the cast of the fourth and final installment of the Hunger Games made an appearance on the show. You can see the full interview from the show here.



The final four contestants on Season 21 of ABC's Dancing With the Stars got in yet another practice ahead of the next week's finals live during the marathon broadcast.





Singer Gloria Estefan and her husband came by for an interview with GMA's Amy Robach to talk about their story coming to life in her recently opened Broadway show On Your Feet!



Ever wonder what would happen if you didn't catch a wink of sleep for nearly two days? Dan Childs, head of ABC News' medical unit, is attempting to find out by staying wide awake for a punishing 40 hours as part of the 40th anniversary schedule of events.



They also took us behind the scene at the GMA Times Square Studios!



You can find more great moments from GMA's "40 for 40" event at on ABCNews.com/GMA40.