A team of scientists and climbers descend into a volcano to get as close as possible to an active lava lake.

A former champion kite surfer attempts to ride to the 12 islands of his home country, Cape Verde.

Mitu Monteiro attempts to travel the 740km between all 12 islands of Cape Verde with nothing but his kite, his board and his resolve.

Watch the mission to stand up paddle board down the Rio Marañón, the source of the Amazon River.

Ben Stookesberry and a group of kayakers attempt a first descent of the Beriman River in Papua New Guinea.

Two paragliders ride thermal winds with Andean condors from sea level up to the peaks of the Andes mountains.

One windsurfer's mission to surf Pedra Branca, a remote wave that may be one of the world's deadliest.

A group of intrepid professional skiers risk it all to ski the remote and desolate Pacific island of Onekotan.

Two veteran alpinists tackle a never-before-climbed route on the remote 3,000m Alaskan peak, the Citadel.

David Lama attempts to be the first person to free climb Cerro Torre, the mountain that changed his life.

Felix Baumgartner attempts a world record-setting 36,500m freefall from the edge of the stratosphere.