•  photo | Zac Efron

Credit: NBC

Published: Friday August 01, 2014 06:00 AM EDT

2014

"One of the weirdest things I've ever done – sleep that close to a man in a cave. #RunningWild"
– Zac Efron, on exploring the Catskill Mountains with British adventurer Bear Grylls for NBC's new reality series Running Wild with Bear Grylls, on Twitter