Visitors take photos at Zhangye Danxia Landform Geological Park in Zhangye City, northwest China's Gansu Province, July 7, 2014. Danxia, which means "rosy cloud", is a special landform formed from reddish sandstone that has been eroded over time into a series of mountains surrounded by curvaceous cliffs and many unusual rock formations. (Xinhua/Wang Song)