Aerial photo taken on Sept 5, 2018 shows the scenery of Danxia landform in Zhangye city, Northwest China’s Gansu province. [Photo/Xinhua]

Photo taken on Sept 5, 2018 shows the scenery of Danxia landform in Zhangye city, Northwest China’s Gansu province. [Photo/Xinhua]

Photo taken on Sept 5, 2018 shows the scenery of Danxia landform in Zhangye city, Northwest China’s Gansu province. [Photo/Xinhua]