Aerial photo taken on May 14, 2019 shows a view at Songji ancient town in Yongchuan District of southwest China's Chongqing. The town, listed as one of China's historical and cultural towns in 2008, has become a popular tourist destination in recent years. (Xinhua/Wang Quanchao)

Aerial photo taken on May 14, 2019 shows a view at Songji ancient town in Yongchuan District of southwest China's Chongqing. The town, listed as one of China's historical and cultural towns in 2008, has become a popular tourist destination in recent years. (Xinhua/Wang Quanchao)

Aerial photo taken on May 14, 2019 shows a view at Songji ancient town in Yongchuan District of southwest China's Chongqing. The town, listed as one of China's historical and cultural towns in 2008, has become a popular tourist destination in recent years. (Xinhua/Wang Quanchao)

Tourists visit Songji ancient town in Yongchuan District of southwest China's Chongqing, May 14, 2019. The town, listed as one of China's historical and cultural towns in 2008, has become a popular tourist destination in recent years. (Xinhua/Wang Quanchao)