Tourists take photos on a glass skywalk at "Secret Dongba" scenic spot in Lijiang, southwest China's Yunnan Province, June 7, 2019. (Xinhua/Qin Qing)

Tourists walk on a glass skywalk at "Secret Dongba" scenic spot in Lijiang, southwest China's Yunnan Province, June 7, 2019. (Xinhua/Qin Qing)

Aerial photo shows tourists walking on a glass skywalk at "Secret Dongba" scenic spot in Lijiang, southwest China's Yunnan Province, June 7, 2019. (Xinhua/Qin Qing)

Aerial photo shows a glass skywalk at "Secret Dongba" scenic spot in Lijiang, southwest China's Yunnan Province, June 7, 2019. (Xinhua/Qin Qing)

Tourists walk on a glass skywalk at "Secret Dongba" scenic spot in Lijiang, southwest China's Yunnan Province, June 7, 2019. (Xinhua/Li Ning)

Tourists lie on a glass skywalk at "Secret Dongba" scenic spot in Lijiang, southwest China's Yunnan Province, June 7, 2019. (Xinhua/Qin Qing)

Tourists visit "Secret Dongba" scenic spot in Lijiang, southwest China's Yunnan Province, June 7, 2019. (Xinhua/Qin Qing)

Tourists take photos on a glass skywalk at "Secret Dongba" scenic spot in Lijiang, southwest China's Yunnan Province, June 7, 2019. (Xinhua/Qin Qing)