5. Walking on air Coiling Dragon Cliff 6.Skywalk, Hunan, China If you’re scared of heights then don’t read any further, because this walkway in China is your worst nightmare come true. The fact that it’s attached 4,600 ft (1,403 m) up the side of a mountain is scary enough, but the fact that it’s also made of glass is nothing short of terrifying. Situated on the side of Tianmen Mountain in Zhangjiajie National Forest Park, the walkway is 328 ft long and 5.2 ft wide. Those who brave the walkway will be rewarded with an utterly breathtaking view that few will ever experience.