A view of the excavation site at the former base of the Japanese Unit 731 in Harbin, Northeast China's Heilongjiang province, July 23, 2015. Unit 731 was a biological and chemical warfare troop set up in China by the Japanese invaders during World War II. Experts have excavated the sites of a bacteria lab, a prison used to keep people for biological experiments, and a boiler room, as well as other facilities, discovering over 1,000 items in nearly two years. (Photo: China News Service/Liu Xiju)
