The Sino-US Cooperation Department Concentration Camp is located at the foot of the Gele Mountain in the northwest of Chongqiang City.

Set up in 1943, the Sino-US Cooperation Department stands for the Sino-US Special Technological Cooperation Department. After Pearl Harbor broke out, the US government signed a secret treaty with the Kuomintang for information on fighting the Japanese. The two sides then agreed to set up an intelligence agency, the Sino-US Cooperation Department. Dai Li, the director general of a spy agency organized by the Military Commission of the KMT Government, was appointed as director; Miles, a major general sent by the US Navy, became deputy director.

The site is situated in a covered area with many mountain chains. Stretching over 10 km, constructions built at the site include the Zhazidong, Plum Garden, the Yangjiashan Stone Yard, the Baigongguan and the Wuling Temple. Apart from the residences of Dai Li, Miles and over 2,000 Chinese and US secret agents and their offices, a number of prisons were also built at the site.

The Sino-US Cooperation Department's main tasks consisted of special wars and psychological warfare against Japanese troops, including the training of Kumintang agents by their US counterparts. After the resistance war against Japan, the joint intelligence agency lost its original functions and became a site where the Kumintang locked up, tortured and killed revolutionary figures and communists. Army Commander Ye Ting of the New Fourth Army was once imprisoned there, and a number of renowned people were killed there, including communists Luo Shiwen, Che Yaoxian, and Jiang Zhuyun, patriotic generals Yang Hucheng and Huangxiansheng, and the revolutionary Song Qiyun. Just before the Kumintang withdrew from the mainland in November of 1949, it slaughtered over 300 revolutionaries -- a mass murder crime that shocked the world. After the liberation, the Chongqing People's Government built a mausoleum for the martyrs and set up a monument and an exhibition hall to commemorate their deeds.