Highlights: Paoju Hutong is located in the northeast of Dongcheng District, Beijing. In the Qing Dynasty, it belonged to the inlaid yellow flag. In Qianlong’s time, this place was the Paojuan, where cannons were made, hence the name of the hutong. At the end of the Qing Dynasty, this place became a prison; during the Anti-Japanese War, this place became a prison where the Japanese invaders detained China's "important criminals". The hutong runs from east to west, the west end folds south, starts from Dongzhimen North Street in the east, reaches Berlin Hutong in the west, and connects with Houyongkang North Alley, Houyongkang No. According to records, during the Anti-Japanese War, it was like a terrifying concentration camp, where more than 3,000 people were detained. At that time, seven bunkers were built around the surrounding wall. Now if you walk around the Paoju Hutong, you can still see 4 well-preserved bunkers, which proves to people the unbearable history. There is a saying in old Beijing: "If you are not honest, you will be sent to the artillery bureau", and this is what it said.