Rock climber Alex Honnold has scaled some of the world's toughest mountains, and he's done it without a rope or harness. The Sacramento native and former UC Berkeley engineering student earned international renown for climbing one of the steepest parts of Yosemite's Half Dome in world record time -- 82 minutes -- and later won Climbing Magazine's "Golden Piton," one of the sport's highest honors. Honnold joins us to talk about tackling some of the world's scariest climbs, and his plans to scale one of the world's tallest buildings in Taiwan.

Watch Alex Honnold free-solo El Sendero Luminoso (The Shining Path) in El Portrero Chico, Mexico:

Alex Honnold Free Soloing in Yosemite