Introduction to the Crime Evidence Exhibition Hall: The Crime Evidence Exhibition Hall of the 731st Unit of the Japanese Invaders of China was built in 1982 and officially opened to the public on August 15, 1985 on the east side of the original 731st Unit Headquarters building. The original museum displays There are more than 120 photos and more than 200 cultural relics on display. The new museum was officially built in 1995 and opened to the public on the occasion of commemorating the 50th anniversary of the victory of the world's anti-fascist movement and the 50th anniversary of the victory of the Chinese People's War of Resistance Against Japanese Aggression.