A photographer takes pictures at a Yadan landform park in Duzhuang township of Datong county, North China’s Shanxi province, May 16, 2015. [Photo/Xinhua]

Tourists visit a Yadan landform park in Duzhuang township of Datong county, North China’s Shanxi province, May 16, 2015.[Photo/Xinhua]

Tourists visit a Yadan landform park in Duzhuang township of Datong county, North China’s Shanxi province, May 16, 2015.[Photo/Xinhua]

Tourists visit a Yadan landform park in Duzhuang township of Datong county, North China’s Shanxi province, May 16, 2015.[Photo/Xinhua]

Tourists visit a Yadan landform park in Duzhuang township of Datong county, North China’s Shanxi province, May 16, 2015.[Photo/Xinhua]