Liu Changsuo, 63 years old, is the only resident living in the slate buildings on the moungtain in Jin'an Village at Shipo Township of Luonan County, northwest China's Shaanxi Province, Aug. 7, 2018. The ancient slate building complex in the Qinling Mountains, also called "daziliang" by local people, is recognized as "a living fossil of ancient folk houses in Qinling Mountains". (Xinhua/Tao Ming)

Tourists visit the slate buildings in Jin'an Village at Shipo Township of Luonan County, northwest China's Shaanxi Province, Aug. 7, 2018. (Xinhua/Tao Ming)

photo taken on Aug. 7, 2018 shows the slate buildings amongst trees in the Qinling Mountains in Jin'an Village at Shipo Township of Luonan County, northwest China's Shaanxi Province. (Xinhua/Tao Ming)

Aerial photo taken on Aug. 7, 2018 shows the slate buildings amongst trees in the Qinling Mountains in Jin'an Village at Shipo Township of Luonan County, northwest China's Shaanxi Province. (Xinhua/Tao Ming)

Aerial photo taken on Aug. 7, 2018 shows the slate buildings amongst trees in the Qinling Mountains in Jin'an Village at Shipo Township of Luonan County, northwest China's Shaanxi Province. (Xinhua/Tao Ming)

Photo taken on Aug. 7, 2018 shows the slate buildings in Jin'an Village at Shipo Township of Luonan County, northwest China's Shaanxi Province. (Xinhua/Tao Ming)

Tourists visit the slate buildings in Jin'an Village at Shipo Township of Luonan County, northwest China's Shaanxi Province, Aug. 7, 2018. (Xinhua/Tao Ming)