Aerial photo taken on March 24, 2020 shows a view of Danxia landform at 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/Xinhua]