A SUV travels on a glass bridge during a load testing at the Grand Canyon of Zhangjiajie, central China's Hunan Province, June 25, 2016. The bridge is 430 meters long, six meters wide and 300 meters above the valley. (Photo: China News Service/ Yang Huafeng)
A visitor strikes the glass-bottomed bridge with a hammer for a safety test at Zhangjiajie Grand Canyon on June 25, 2016 in Zhangjiajie, Hunan Province of China. The bridge is 430 meters long, six meters wide and 300 meters above the valley. (Photo: China News Service/ Yang Huafeng)
Visitor strike the glass-bottomed bridge with hammers for a safety test at Zhangjiajie Grand Canyon on June 25, 2016 in Zhangjiajie, Hunan Province of China. The bridge is 430 meters long, six meters wide and 300 meters above the valley. (Photo: China News Service/ Yang Huafeng)
Visitor strike the glass-bottomed bridge with hammers for a safety test at Zhangjiajie Grand Canyon on June 25, 2016 in Zhangjiajie, Hunan Province of China. The bridge is 430 meters long, six meters wide and 300 meters above the valley. (Photo: China News Service/ Yang Huafeng)
Visitor strike the glass-bottomed bridge with hammers for a safety test at Zhangjiajie Grand Canyon on June 25, 2016 in Zhangjiajie, Hunan Province of China. The bridge is 430 meters long, six meters wide and 300 meters above the valley. (Photo: China News Service/ Yang Huafeng)
A SUV travels on a glass bridge during a load testing at the Grand Canyon of Zhangjiajie, central China's Hunan Province, June 25, 2016. The bridge is 430 meters long, six meters wide and 300 meters above the valley. (Photo: China News Service/ Yang Huafeng)
A SUV travels on a glass bridge during a load testing at the Grand Canyon of Zhangjiajie, central China's Hunan Province, June 25, 2016. The bridge is 430 meters long, six meters wide and 300 meters above the valley. (Photo: China News Service/ Yang Huafeng)
A SUV travels on a glass bridge during a load testing at the Grand Canyon of Zhangjiajie, central China's Hunan Province, June 25, 2016. The bridge is 430 meters long, six meters wide and 300 meters above the valley. (Photo: China News Service/ Yang Huafeng)
A SUV travels on a glass bridge during a load testing at the Grand Canyon of Zhangjiajie, central China's Hunan Province, June 25, 2016. The bridge is 430 meters long, six meters wide and 300 meters above the valley. (Photo: China News Service/ Yang Huafeng)
Visitor strike the glass-bottomed bridge with hammers for a safety test at Zhangjiajie Grand Canyon on June 25, 2016 in Zhangjiajie, Hunan Province of China. The bridge is 430 meters long, six meters wide and 300 meters above the valley. (Photo: China News Service/ Yang Huafeng)
A visitor strikes the glass-bottomed bridge with a hammer for a safety test at Zhangjiajie Grand Canyon on June 25, 2016 in Zhangjiajie, Hunan Province of China. The bridge is 430 meters long, six meters wide and 300 meters above the valley. (Photo: China News Service/ Yang Huafeng)
