Photo taken on July 20, 2013 shows the scenery of Danxia landform at Pingshan Lake scenic area in Zhangye, Northwest China's Gansu Province. 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 Jiang)

Photo taken on July 20, 2013 shows the scenery of Danxia landform at Pingshan Lake scenic area in Zhangye, Northwest China's Gansu Province. 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 Jiang)

Tourists view the scenery of Danxia landform at Pingshan Lake scenic area in Zhangye, Northwest China's Gansu Province, July 20, 2013. 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 Jiang)

 Photo taken on July 20, 2013 shows the scenery of Danxia landform at Pingshan Lake scenic area in Zhangye, Northwest China's Gansu Province. 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 Jiang)

Visitors view the scenery of Danxia landform at Pingshan Lake scenic area in Zhangye, Northwest China's Gansu Province, July 20, 2013. 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 Jiang)

Photo taken on July 20, 2013 shows the scenery of Danxia landform at Pingshan Lake scenic area in Zhangye, Northwest China's Gansu Province. 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 Jiang)

Tourists view the scenery of Danxia landform at Pingshan Lake scenic area in Zhangye, Northwest China's Gansu Province, July 20, 2013. 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 Jiang)

Photo taken on July 20, 2013 shows the scenery of Danxia landform at Pingshan Lake scenic area in Zhangye, Northwest China's Gansu Province. 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 Jiang)

Tourists view the scenery of Danxia landform at Pingshan Lake scenic area in Zhangye, Northwest China's Gansu Province, July 20, 2013. 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 Jiang)

Photo taken on July 20, 2013 shows the scenery of Danxia landform at Pingshan Lake scenic area in Zhangye, Northwest China's Gansu Province. 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 Jiang)