excalibur holland climbing wall I almost wonder how many people come every day! Do you have to get a special pass? Do they kick you out after 45 minutes? How do they regulate traffic to the biggest unnatural climbing wall in the world?
At least 4000 feet in the air a three-foot-wide walkway clings to one face of Tianmen Mountain in Zhangjiajie, China, above a rocky ravine. With a glass bottom, the tourist attraction provides a crystal-clear view of where one wrong step could take you.