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.
Speed alpinist Ueli Steck dances up faces in the Himalaya and the Alps, including his record-smashing ascent of The Eiger North Face. Ueli also teams up with fellow soloist Alex Honnold to break records on El Capitan.
Ueli Steck learns to fly a paraglider and uses it to enchain multiple peaks in record time.
British explorer Leo Houlding, French climber Jean Burgun and New Zealand cameraman Mark Sedon ski across a continent of ice to take Antarctica's Spectre, the most remote mountain on earth.
