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.

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.

El Capitan free-climbing master Tommy Caldwell battles his ultimate project, making the first ascent of the 3,000 foot overhanging Dawn Wall.

The touching story of young climbing protege Ashima Shiraishi, and her passionate coach, Obe Carrion, who is overcoming his own obstacles in helping his apprentice reach the upper levels of the sport.

Welcome to the wildest competition known to man -- the speed record on the Nose route of El Capitan. Yosemite legends Dean Potter and Hans Florine go head-to-head, racing up 3,000 feet of vertical rock in under three hours, risking life and limb.

'Sketchy' Andy Lewis takes the fledgling sport of slack-lining to new heights, performing aerial tricks like back-flips, BASEjumping off the line and even soloing highlines naked.