Alex Honnold: How I Climbed A 3,000-Foot Vertical Cliff - Without Ropes

Imagine being by yourself in the dead center of a 3,000-foot vertical cliff -- without a rope to catch you if you fall. For professional rock climber Alex Honnold, this dizzying scene marked the culmination of a decade-long dream. In a hair-raising talk, he tells the story of how he summited Yosemite's El Capitan, completing one of the most dangerous free solo climbs ever.

Alex Honnold is a professional rock climber whose audacious free-solo ascents of America's biggest cliffs have made him one of the world's most recognized climbers.