Tourists visit a rock cave of the Northern Wei Dynasty (386-534) on Tianhuang Mountain in Huailai, north China's Hebei Province, April 21, 2017. (Xinhua/Yang Shiyao)
Tourists visit rock cave of Northern Wei Dynasty in north China's Hebei
Source: Xinhua| 2017-04-22 14:03:12|Editor: Lu Hui
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