Titlis Cliff Walk, Switzerland
The Titlis Cliff Walk sits about 10,000 feet above sea level on the side of its namesake mountain high in the Swiss Alps. Designed like a suspension bridge, the Cliff Walk has an overall length of more than 300 feet, but its width is less than 3 feet. A glacier sits more than 1,500 feet below the walkway, and on a clear day, visitors can see across the Alps all the way to Italy. Titlis is widely considered the highest suspension bridge in Europe and one of the highest, in terms of altitude above sea level, in the entire world. Because of the severity of the drop on either side of the bridge, the Cliff Walk is often closed during periods of high wind and low visibility.