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Tianmen Mountain Tianmenshan cable way,cliff walk,winding road 天门山索道、栈道、盘山公路与世界高跨比最大的桥 Zhangjiajie, Hunan, China/Tianmenshan Cliffwalk and Glasswalk 张家界天门山栈道和玻璃栈道 Zhangjiajie, Hunan, China 984 feet high / 300 meters high 6 foot span / 2 meter span 2011 Without question the highest and most spectacular of all of the world’s cliffwalks is the hiking path that skirts around the upper edge of Tianmen Mountain near Zhangjiajie City, Hunan Province. The top of this peak was inaccessible to tourists until a gondola cableway was built from the center of the city to a point near the summit. With a length of 7,455 meters, it is one of the longest gondolas in the world as well as one of the highest with an elevation gain of 1,279 meters. The steepest section of the ropeway reaches 37 degrees. The other big attraction on Tianmen mountain is the 99-turn bus road that reaches the base of the giant Tianmen Cave - a natural hole in the mountain that measures 131.5 meters in height. The Tianmenshan Cliffwalk is one of many cantilevered hiking paths that have sprung up around China since the 1990s and all were made with similar construction techniques. Horizontal steel beams encased in concrete are placed 2 to 4 meters apart inside of holes drilled horizontally into the side of the mountain. Flat concrete panels span between the support beams. Most pathways are between 1.5 and 2 meters wide depending on the random shape of the cliff wall surface where the structure is connected. The Tianmen cliffwalk also has a glass section around 60 meters in length that requires wearing supplied booties around your shoes to avoid scratching the surface. The drop below the glass panels is approximately 250 meters while the drop below the highest point on the concrete surfaced cliffwalk is 300 meters. In 2015 several more sections of cantilevered walkway were added to the backside of Tianmen Mountain over the top and alongside the bottom of the giant 131 meter high hole. Since 2012, BASE jumping events have taken place over a section of the famous 99 turns bus road and alongside the gondola. www.highestbridges.com