
Tourists tour by boats in Chengde Mountain Resort, an UNESCO World Cultural Heritage, in Chengde City, north China's Hebei Province, Aug. 3, 2017. Chengde Mountain Resort once served emperors of the Qing Dynasty (1644-1911). (Xinhua/Liu Huanyu)

Tourists tour by boats in Chengde Mountain Resort, an UNESCO World Cultural Heritage, in Chengde City, north China's Hebei Province, Aug. 3, 2017. Chengde Mountain Resort once served emperors of the Qing Dynasty (1644-1911). (Xinhua/Liu Huanyu)