731 Japanese Invaders Evidence Exhibition Hall is located in Pingfang district and was founded in late 1982. After years of expansion, the new hall was opened to the public on August 15, 1995, the memorial day of the anti-Fascist war and the 50th anniversary of the victory of the War of Resistance against Japanese Aggression. There are buildings, guards, a material supply services room, arsenal, four-sided building, ad-hoc prison, Yamaguchi classes (bacteria bomb assembly) and other sites in the 731 units of the existing headquarters. Unit 731 was a covert biological and chemical warfare research and development unit of the Imperial Japanese Army that undertook lethal human experimentation during the War of Resistance against Japanese Aggression.