Glass Walkway in Tianmen Mountain National Park, Hunan, China.
Photographs by Dingyun Juan.
The 2.5 inch crystal-clear glass pathway is located 4700 ft (1430 m) above sea level on the side of Tianmen Mountain. Approximately 200 ft (61 m) long, it offers walkers a vertigo-inducing look at the sheer drops and wilderness below.