#6. Siula Grande, Peruvian Andes 6,344 metres (20,814 ft.)
In 1985, the duo of Joe Simpson and Simon Yates, whose journey was chronicled in the book and film Touching the Void, attempted the western face of Siula Grande: a sheer, vertical ascent that had never been completed. They made it to the summit but Simpson fell during the descent, breaking his leg. Then Yates, lowering the injured Simpson down by rope, lost sight of him over a cliff. After an hour passed, with his position slipping away, and Simpson unable to secure himself, Yates cut the rope. Incredibly, Simpson survived the 100 ft. fall into a crevasse. Over the next three days he subsisted on melted snow and hopped the five miles back to camp, arriving shortly before Yates, assuming Simpson had perished, was due to depart for home.