How Tall Is Mount Everest?

Geologists from around the world have disputed the mammoth mountain's height, creating consequences for Nepal.

Extreme Conditions Delay 'Killer Mountain' Rescue

Elisabeth Revol and Tomek Mackiewicz were believed to have reached the summit of Pakistan's Nanga Parbat—the ninth-highest mountain in the world—before struggling to make their way down the 26,600-foot peak.

The Dawn Wall: The Inside Story

A hardened mountaineer explains the mind-bogglingly difficult climb the two young men faced on El Capitan, Yosemite.

After the Climb

Tommy Caldwell and Kevin Jorgeson talk about their historic Yosemite climb, and ask: "What's your Dawn Wall?"