The first ascent of the north face of Eiger, a mountain in the Swiss Alps (13,025 feet tall), happened in 1938 and took three days. Watch as Ueli Steck climbs it in 2 hours, 47 minutes, and 33 seconds.
The whole thing is pretty much insane, but you’ll really want to start paying attention around the 2:15 mark. He’s running up that mountain! (via devour)