Trail path in China’s Tianmen Mountain National Park offers visitors an unusual experience: The floor and rails of the pathway are composed of glass, offering walkers a vertigo-inducing look at the sheer drops and wilderness below. The walkway spans three feet wide, composed of glass 2.5-inches thick. Measuring approximately 200 feet (61 meters) long, the walkway is raised almost a mile into the air at about 4700 feet (1430 meters), inviting comparisons to the grand canyon ‘skywalk’ in arizona, USA. The passage joins the west cliff at the Yunmeng fairy summit, where Tianmen mountain and Zhang Jiajie meet. Visitors to the Tianmen mountain bridge are requested to wear shoe covers to keep the glass transparent and clean.