In the golden autumn of September, the trip to the north Xinjiang - the fortress of Hailar (16), "the fortress of Hailar of the Japanese army invading China", also known as the "the site of Beishan of the fortress of the Japanese army invading China", located at the foot of the Baoshan Mountain in the northern part of the Workers' New Village in Hailar City, was during the Second World War, from 1934 to 1939. One of the two largest fortifications of the 17 military fortifications established by the Japanese Kanto Army to attack the Soviet Union on the northeast border of China is a complex ground and underground project, large scale, fully equipped ring defense position, all reinforced concrete structures, once known as "underground city". It is a fortress built by Chinese laborers, tears and lives, and is a crime of Japanese imperialism invading China. It is now a key cultural relics protection unit in the autonomous region and a patriotic education base for "Forget the National Shame".