El Capitan - the world's toughest climb? in 90 seconds

Kevin Jorgeson and Tommy Caldwell have become the first free-climbers to scale El Capitan's Dawn Wall - a sheer slab of granite rising vertically for 900 metres (2,953ft) from the Yosemite National Park valley in California.

They spent 19 days hauling themselves up using fingertip holds in razor-sharp rocks and, despite badly torn fingers and bitterly cold winds, reached the summit on 14 January.

BBC News takes a look at the Dawn Wall - arguably the toughest rock to climb in the world.

Video produced by Michael Hirst