Aerial photo taken on March 24, 2020 shows a tourist bus at the Danxia National Geological Park in Zhangye, northwest China's Gansu Province. Boasting a unique type of geomorphology formed from red-colored sandstones and characterized by steep cliffs, the Danxia National Geological Park reopened to the public under strict measures to fight against the COVID-19. (Photo by Zhang Zhimin/Xinhua)
