Every year the Iditarod sled race runs over approximately 1800 kilometres through dense Alaskan wilderness, harsh mountains and lonely tundra.

It's time to come clean about one of the internet's worst-kept secrets and our regular cure for Monday-itis. 

Bear 71 is the female subject of Leanne Allison and Jeremy Mendes's interactive web documentary produced for the National Film Board of Canada.

At first glance Adam Ondra is a guy who looks more suited to building mainframes than climbing boulders, but he happens to be one of the best climbers in the world.

The staid elegance of cold river fly fishing makes a serene background to Active Child's latest song "Hanging On". 

Anyone of a vaguely artistic disposition has probably thought about getting a residency at some point. Cabin Time just might be your chance. 

At a time when things are getting faster, Heike Mutter and Urlich Genthe's walkable roller coaster is a welcome relief, a leisurely delight, and a playful Escher-esque anomaly.

David Attenborough lives the stuff of our kid (and adult) dreams. This time he's trekking through the polar ice caps and into the frozen wilderness of Alaska and Antarctica for Frozen Planet.

A new walkway at Tianmen Mountain National Park in China puts two-and-a-half inches of glass between visitors and a crapload of thin air.

Don't watch this trailer if you're scared of heights. Don't watch this trailer if the thought of sommersaulting off the edge of a cliff makes your palms sweat.