A tourist fastened by safty belt experiences sightseeing in the air on the Yunding glass-made plank road on a skyscraper in Liuzhou, south China's Guangxi Zhuang Autonomous Region, May 5, 2016. The Yunding plank road has attracted more than 8,000 tourists since it opened on Dec. 5, 2015. (Xinhua/Zhou Hua)

A tourist fastened by safty belt experiences sightseeing in the air on the Yunding glass-made plank road on a skyscraper in Liuzhou, south China's Guangxi Zhuang Autonomous Region, May 5, 2016. The Yunding plank road has attracted more than 8,000 tourists since it opened on Dec. 5, 2015. (Xinhua/Zhou Hua)

A tourist fastened by safty belt experiences sightseeing in the air on the Yunding glass-made plank road on a skyscraper in Liuzhou, south China's Guangxi Zhuang Autonomous Region, May 5, 2016. The Yunding plank road has attracted more than 8,000 tourists since it opened on Dec. 5, 2015. (Xinhua/Zhou Hua)

A tourist fastened by safty belt experiences sightseeing in the air on the Yunding glass-made plank road on a skyscraper in Liuzhou, south China's Guangxi Zhuang Autonomous Region, May 5, 2016. The Yunding plank road has attracted more than 8,000 tourists since it opened on Dec. 5, 2015. (Xinhua/Zhou Hua)

A tourist fastened by safty belt experiences sightseeing in the air on the Yunding glass-made plank road on a skyscraper in Liuzhou, south China's Guangxi Zhuang Autonomous Region, May 5, 2016. The Yunding plank road has attracted more than 8,000 tourists since it opened on Dec. 5, 2015. (Xinhua/Zhou Hua)

A tourist fastened by safty belt experiences hanging in the air on the Yunding glass-made plank road on a skyscraper in Liuzhou, south China's Guangxi Zhuang Autonomous Region, May 5, 2016. The Yunding plank road has attracted more than 8,000 tourists since it opened on Dec. 5, 2015. (Xinhua/Zhou Hua)