TONGREN, Feb 24, 2016 (Xinhua) -- Tourists walk on a glass skywalk in the National Mine Park of Tongren city, southwest China's Guizhou province, Feb 24, 2016. The 1,005-meter-long and 1.6-meter wide glass skywalk, with more than 100 meters above the valley bottom, has passed a safety test and will be opened to the public in May. (Xinhua/Liu Xu)