Video PlayerClose
People visit the Mogao Grottoes, a world cultural heritage site, in Dunhuang, northwest China's Gansu Province, April 18, 2019. (Xinhua/Zhang Xiaoliang)
People visit the Mogao Grottoes, a world cultural heritage site, in Dunhuang, northwest China's Gansu Province, April 18, 2019. (Xinhua/Zhang Xiaoliang)