What is the history of Hongyadong in Chongqing? Can someone tell me?

In the early years of the Ming Dynasty, Dai Ding built Chongqing, with seventeen gates, nine open and eight closed, and Hongyamen was one of them closed. Although it looks like a tower and a door, it has no door and can't get in and out. It is used purely for military purposes. Hongyamen faces Jialing River and can control a long section of the river. There is a hole under the cliff on the right under Hongya Gate, which is Hongya Cave.

There used to be a stream on Hongyadong, which originated from Daliangzi (now Xinhua Road) in the city, passed through Dayanggou and Huixian Bridge to Hongyadong, and fell from the cliff to form a waterfall. "Red Cuisine" has always been a major landscape in Chongqing. Later, the trees in the city were cut down and the population increased. The stream has become a sewage ditch, and Hongya no longer drops "green" but hangs a sewage waterfall. After the beginning of the Anti-Japanese War, the population of Chongqing soared, and the center of Chongqing moved from the lower half to the upper half. The sewage in the upper part of the city flows to Hongyadong, and the garbage also falls from Hongyadong to the cliff, so there are piles of garbage collectors here. In addition, Hongyadong can avoid the wind and rain, so Hongyadong has become the nest of Hua 'er "beggar".

In the 1940s, Chongqing talents opened a road on the cliff, connecting the inside and outside of the city. Hongyadong is adjacent to Zhenjiang Temple and Paper Salt River Street, both of which are docks and quite lively. As a result, rows of diaojiao buildings were built under the cliffs on both sides of Hongyadong. Layers of overlapping, patchwork, like shaking, constitute the unique scenery of Chongqing.