Aerial photo taken on April 4, 2019 shows Songji ancient town in Yongchuan District of southwest China's Chongqing. The town, located along the Yangtze River, was a bustling place in Ming (1368-1644) and Qing (1644-1911) dynasties due to the wharves here. It was listed as one of China's historical and cultural towns in 2008. (Xinhua/Liu Chan)