Tourists visit the Danxia National Geopark in Linze County of Zhangye City, northwest China's Gansu Province, April 28, 2018. Boasting the Danxia National Geopark, Linze County has received 5.2 million tourists in 2017, up 39.11 percent compared with the previous year and generated tourism revenue of 2.99 billion yuan (472 million U.S. dollars). (Xinhua/Li Xiao)