A residential house is seen at the Yunshuiyao ancient town in Nanjing County, southeast China's Fujian Province, Nov. 23, 2018. (Xinhua/Lin Shanchuan)

People visit tulou, a unique residential architecture, at the Yunshuiyao ancient town in Nanjing County, southeast China's Fujian Province, Nov. 23, 2018. (Xinhua/Lin Shanchuan)

People visit Yunshuiyao ancient town in Nanjing County, southeast China's Fujian Province, Nov. 23, 2018. (Xinhua/Lin Shanchuan)

People take photos at the Yunshuiyao ancient town in Nanjing County, southeast China's Fujian Province, Nov. 23, 2018. (Xinhua/Lin Shanchuan)

Tulou, a unique residential architecture, is seen at the Yunshuiyao ancient town in Nanjing County, southeast China's Fujian Province, Nov. 23, 2018. (Xinhua/Lin Shanchuan)

People visit Yunshuiyao ancient town in Nanjing County, southeast China's Fujian Province, Nov. 23, 2018. (Xinhua/Lin Shanchuan)

Tulou, a unique residential architecture, is seen at the Yunshuiyao ancient town in Nanjing County, southeast China's Fujian Province, Nov. 22, 2018. (Xinhua/Lin Shanchuan)

People visit Yunshuiyao ancient town in Nanjing County, southeast China's Fujian Province, Nov. 24, 2018. (Xinhua/Lin Shanchuan)

People visit Yunshuiyao ancient town in Nanjing County, southeast China's Fujian Province, Nov. 23, 2018. (Xinhua/Lin Shanchuan)

Aerial photo taken on Nov. 23, 2018 shows the Yunshuiyao ancient town in Nanjing County, southeast China's Fujian Province. (Xinhua/Lin Shanchuan)