Introduction to the West Line Glass Plank Road: The Tianmen Mountain Glass Plank Road hangs on the west line of the top of the mountain. It is 60 meters long, with the highest point at an altitude of 1,430 meters and a width of 1.6 meters. The entire line is made of transparent glass. The excitement and shock this glass walkway brings to people is comparable to the world-famous "Sky Road" glass corridor in the Grand Canyon of the United States.