Aerial photo taken on Jan. 26, 2019 shows tourists viewing the scenery of Xiandao Lake on an observation deck with glass floor in Wangying Township of Yangxin County, central China's Hubei Province. The observation deck was built on the top of 520-meter-high Qianli Mountain, which is a proper site for viewing Xiandao Lake scenery. (Xinhua/Ke Hao)

　　Aerial photo taken on Jan. 26, 2019 shows tourists viewing the scenery of Xiandao Lake on an observation deck with glass floor in Wangying Township of Yangxin County, central China's Hubei Province. The observation deck was built on the top of 520-meter-high Qianli Mountain, which is a proper site for viewing Xiandao Lake scenery. (Xinhua/Ke Hao)

　　Aerial photo taken on Jan. 26, 2019 shows tourists viewing the scenery of Xiandao Lake on an observation deck with glass floor in Wangying Township of Yangxin County, central China's Hubei Province. The observation deck was built on the top of 520-meter-high Qianli Mountain, which is a proper site for viewing Xiandao Lake scenery. (Xinhua/Ke Hao)