Photo taken on April 1, 2013 shows a scenic view of Danxia Landform in Zhangye City, northwest China's Gansu Province. Danxia is a special landform from reddish sandstone that has been eroded over time into a series of mountains surrounded by curvaceous cliffs and many unusual rock formations. (Xinhua/Shi Youdong) 

A visitor views the Danxia Landform in Zhangye City, northwest China's Gansu Province, April 1, 2013. Danxia is a special landform from reddish sandstone that has been eroded over time into a series of mountains surrounded by curvaceous cliffs and many unusual rock formations. (Xinhua/Shi Youdong) 

A visitor views the Danxia Landform in Zhangye City, northwest China's Gansu Province, April 1, 2013. Danxia is a special landform from reddish sandstone that has been eroded over time into a series of mountains surrounded by curvaceous cliffs and many unusual rock formations. (Xinhua/Shi Youdong)