Video PlayerClose

Tourists visit the Crescent Spring and Singing Sand Dune scenic area in Dunhuang, northwest China's Gansu Province, Oct. 2, 2017. (Xinhua/Zhang Xiaoliang)

Tourists visit the Crescent Spring and Singing Sand Dune scenic area in Dunhuang, northwest China's Gansu Province, Oct. 2, 2017. (Xinhua/Zhang Xiaoliang)