It was built by the Soviet Union in World War II to defend against the invasion of German fascism. It runs throughout western Belarus. It is 1,200 kilometers long. It runs from the Karelia Isthmus in the north to the Black Sea coast in the south. It is composed of 23 large fortress areas, including more than 4,000 permanent fire points, all made of reinforced concrete and special materials. The defense line in Minsk section is about 140 kilometers long, and there are 327 permanent fire points scattered in the depth of 1-6 kilometers. The walls of the fortification are 5 meters thick, how strong it is! (For WWI) the fortification contains 76 mm artillery and Maxim machine guns, as well as observation periscope. The power generation equipment installed in 1938 still works. There are side dark forts everywhere, and there are various engineering obstacles and mine areas in front. Fortifications are not exactly the same as two fire points, but are built according to specific tasks and terrain. Some fire points are one-layered, some are double-layered, and there are bomb shelters below.