Aerial photo taken on May 16, 2020 shows the scenery of Hong'an ancient town in Xiushan County, southwest China's Chongqing Municipality. (Xinhua/Wang Quanchao)

Aerial photo taken on May 16, 2020 shows the scenery of Hong'an ancient town in Xiushan County, southwest China's Chongqing Municipality. (Xinhua/Wang Quanchao)

Aerial photo taken on May 16, 2020 shows the scenery of Hong'an ancient town in Xiushan County, southwest China's Chongqing Municipality. (Xinhua/Wang Quanchao)

Tourists take a boat near the Hong'an ancient town in Xiushan County, southwest China's Chongqing Municipality, May 16, 2020. (Photo by Huang Wei/Xinhua)

Aerial photo taken on May 16, 2020 shows the scenery of Hong'an ancient town in Xiushan County, southwest China's Chongqing Municipality. (Xinhua/Wang Quanchao)