New River Gorge Bridge, West Virginia

This 876-foot tall bridge, completed in 1977, is the largest single arch steel span in the country, and the third-highest bridge as well. (The Royal Gorge Bridge over the Arkansas River in Colorado is higher.) It eliminated the 40-minute drive through mountain roads formerly required to cross the New River. On the third Saturday each October (Bridge Day), the bridge is open to pedestrians. It is legal to parachute from the bridge deck to the river below.