Photo taken on May 13, 2017 shows the residential houses built on the mountain slopes in Nuodeng village, Yunlong county, Southwest China's Yunnan province. Nuodeng ancient village, located in the valley to the north of Yunlong county, reserves numerous ancient buildings and cultural heritages of the Ming (1368-1644) and Qing (1644-1911) dynasties. Over 200 families of Bai ethnic group reside in the ancient village. [Photo/Xinhua]