Tianmen Mountain is undoubtedly one of the best places to visit in Zhangjiajie. The name of the mountain comes from the natural karst Tianmen Cave on the top, which is 431 feet high and 187 feet wide, like a gate leading to heaven. Besides the grand cave, you will have a chance to experience the longest cable way in the world with a length of 7,455 meters (24,458 feet) and enjoy the full view of the mountain in the cable car within 30 minutes. Ancient trees and twining vines are ubiquitous in the whole scenic area. Besides appreciating the old-growth forest and Tianmen Mountain Temple, trying the transparent glass skywalks built along the cliff is also an exciting thing you can’t miss.