Photo taken on July 11, 2014 shows the entrance to a gallery of the Fushun War Criminals Management Center in Fushun, northeast China's Liaoning Province. The eight Chinese characters on the wall denote "humanity", "justice", "truth" and "peace". In the Fushun War Criminals Manage Center, 982 Japanese prisoners had been kept in custody for war crimes committed during the World War II. The facility has seen more than four million visitors since its public opening in 1986, including 30,000 from Japan. It has also been re-visited by about 300 former Japanese inmates. (Xinhua/Yao Jianfeng)

Photo taken on July 11, 2014 shows an activity hall inside the Fushun War Criminals Management Center in Fushun, northeast China's Liaoning Province. In the Fushun War Criminals Manage Center, 982 Japanese prisoners had been kept in custody for war crimes committed during the World War II. The facility has seen more than four million visitors since its public opening in 1986, including 30,000 from Japan. It has also been re-visited by about 300 former Japanese inmates. (Xinhua/Yao Jianfeng)

Photo taken on July 11, 2014 shows a dove of peace banner donated by re-visiting former Japanese inmates of the Fushun War Criminals Management Center in Fushun, northeast China's Liaoning Province. In the Fushun War Criminals Manage Center, 982 Japanese prisoners had been kept in custody for war crimes committed during the World War II. The facility has seen more than four million visitors since its public opening in 1986, including 30,000 from Japan. It has also been re-visited by about 300 former Japanese inmates. (Xinhua/Yao Jianfeng)

Photo taken on July 11, 2014 shows a dormitory ward inside the Fushun War Criminals Management Center in Fushun, northeast China's Liaoning Province. In the Fushun War Criminals Manage Center, 982 Japanese prisoners had been kept in custody for war crimes committed during the World War II. The facility has seen more than four million visitors since its public opening in 1986, including 30,000 from Japan. It has also been re-visited by about 300 former Japanese inmates. (Xinhua/Yao Jianfeng)

Photo taken on July 11, 2014 shows a confession monument at the Fushun War Criminals Management Center in Fushun, northeast China's Liaoning Province. In the Fushun War Criminals Manage Center, 982 Japanese prisoners had been kept in custody for war crimes committed during the World War II. The facility has seen more than four million visitors since its public opening in 1986, including 30,000 from Japan. It has also been re-visited by about 300 former Japanese inmates. (Xinhua/Yao Jianfeng)

Photo taken on July 11, 2014 shows a clinic inside the Fushun War Criminals Management Center in Fushun, northeast China's Liaoning Province. In the Fushun War Criminals Manage Center, 982 Japanese prisoners had been kept in custody for war crimes committed during the World War II. The facility has seen more than four million visitors since its public opening in 1986, including 30,000 from Japan. It has also been re-visited by about 300 former Japanese inmates. (Xinhua/Yao Jianfeng)

Photo taken on July 11, 2014 shows the entrance to the Fushun War Criminals Management Center in Fushun, northeast China's Liaoning Province. In the Fushun War Criminals Manage Center, 982 Japanese prisoners had been kept in custody for war crimes committed during the World War II. The facility has seen more than four million visitors since its public opening in 1986, including 30,000 from Japan. It has also been re-visited by about 300 former Japanese inmates. (Xinhua/Yao Jianfeng)

Photo taken on July 11, 2014 shows the health records of the former Japanese inmates of the Fushun War Criminals Management Center in Fushun, northeast China's Liaoning Province. In the Fushun War Criminals Manage Center, 982 Japanese prisoners had been kept in custody for war crimes committed during the World War II. The facility has seen more than four million visitors since its public opening in 1986, including 30,000 from Japan. It has also been re-visited by about 300 former Japanese inmates. (Xinhua/Yao Jianfeng)

A staff introduces the former Japanese inmates at the Fushun War Criminals Management Center in Fushun, northeast China's Liaoning Province, July 11, 2014. In the Fushun War Criminals Manage Center, 982 Japanese prisoners had been kept in custody for war crimes committed during the World War II. The facility has seen more than four million visitors since its public opening in 1986, including 30,000 from Japan. It has also been re-visited by about 300 former Japanese inmates. (Xinhua/Yao Jianfeng)