Look down if you dare: 14 of world's most vertigo-inducing glass skywalks (8/15)

Shanghai, China

Safety instructors give a demonstration on a skywalk 340 meters above the ground at Jinmao Tower in Shanghai, east China, July 28, 2016. A fenceless, glass skywalk outside the 88th floor of the 420.5-meter Jin Mao Tower started a trial run on Thursday. (Xinhuad/Pei Xin)