For those with a fear of heights, please hold onto your medicine while viewing. We present 20 of the world’s most dangerous bridge tops that will make your hands and feet tremble.

Zhangjiajie Glass Bridge (China)

The Zhangjiajie Glass Bridge, located in Zhangjiajie, Hunan Province, China, opened in 2016 as the world’s longest and highest glass-bottom bridge. This bridge is 1,410 feet long and 20 feet wide, and is installed at a height of approximately 980 feet above the ground. It connects two mountains in Zhangjiajie National Forest Park and can accommodate approximately 800 tourists at a time.

Designed by Israeli architect Haim Dotan, the bridge is composed of more than 120 glass panels. The bridge is supported by four large pillars, with three long swings installed underneath. A bungee jumping facility is also planned at a height of 935 feet.