Bai Mansion in Chongqing was originally the villa of Sichuan warlord Bai Juyi, hence its name. 1939? 1996, the Kuomintang Military Bureau converted this place into a prison, 1943, and the Sino-American Cooperation Institute was changed into the first prison. ? The prison is backed by Gele Mountain? Surrounded by high walls and dense power grids, there are sentry boxes and bunkers on the commanding heights outside the walls. The door is closed all the year round, and only a small door is opened on the side to communicate with the outside world. There are 20 cells in the prison.