Workers check and replace glass on a glass walkway, suspended 180 meters in the air, in the Shiniuzhai National Geological Park in Pingjiang County, Central China’s Hunan Province, Sept. 18, 2017. Authorities at the park ensure a comprehensive check of the glass-bottomed bridge is conducted to prepare for peak tourist numbers during the National Day holiday from Oct. 1 to 8. (Photo: China News Service/Yang Huafeng)
