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Chris Sharma, the "king" of sport climbing battles with Czech wunderkind, Adam Ondra, to make the first ascent of the world's most difficult climb.
El Capitan free-climbing master Tommy Caldwell battles his ultimate project, making the first ascent of the 3,000 foot overhanging Dawn Wall.
Over the past 26 years, 16 expeditions have tried and failed to climb one of Pakistan's 8,000 meter peaks in winter. In 2011, Simone Moro, Denis Urubko and Cory Richards became the first. The journey nearly killed them.
Will Gadd and Tim Emmett discover the holy grail of ice climbing, Helmcken Falls, Canada where a cave features hundreds of feet of overhanging, barely climbable ice.