This Month in Photo of the Day: Adventure and Exploration Photos

Alex Honnold takes on the third zigzag of Half Dome without a rope. He has just one more difficult section, or pitch, in the last three before reaching the summit.

See more pictures from the May 2011 feature story "Daring. Defiant. Free."

Watch a video of Alex performing a free-solo climb »
See more pictures of extreme sports »
Learn more about Yosemite National Park »