Tourists visit ancient Taoist temples built on the cliff in Sanggan River canyon in Xuanhua County, north China's Hebei Province, July 20, 2015. (Photo: Xinhua/Yang Shiyao)
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Tourists visit ancient Taoist temples built on the cliff in Sanggan River canyon in Xuanhua County, north China's Hebei Province, July 20, 2015. (Photo: Xinhua/Yang Shiyao)
