Edge of the Earth

In Alaska's Glacier Bay National Park, three elite athletes attempt a descent on Mount Bertha that has never been snowboarded or skied.

Three accomplished whitewater kayakers set out to be the first group to cross Ecuador's Llanganates National Park via the Chalupas River.

Climbers Emily Harrington and Adrian Ballinger attempt a free ascent on Kyrgyzstan's Pik Slesova.

Ian Walsh and Grant "Twiggy" Baker travel to the remote waters of Africa's West Coast to establish it as the next big-wave surf location.