Alex Honnold, Angel Collinson And More Extreme Athletes Star In Thrilling New Nat Geo Series ‘Edge Of The Unknown’

In his new 10-part Nat Geo series 'Edge of the Unknown,' which premieres Monday, Sept. 5, alpinist and filmmaker Jimmy Chin explores the role of fear and risk in extreme athletes' endeavors and what drives them. The series features 'Free Solo' climber Alex Honnold, skier Angel Collinson, and more.