This 40-foot-long sliver of granite on Half Dome, named the Thank God Ledge, is the only way to get beyond the Visor, a massive roof that looms over the Regular Northwest Face route. Most people crawl, says Alex Honnold, but he prefers to walk it, face out, since that's "cooler." The 30 seconds it takes to get across requires absolutely no technical climbing skill, but even Honnold admits it's sobering to look at 1,800 feet of air.