A well-preserved defensive structure of Kaliningrad. The area is 350×180 meters, the depth is 3-5 meters. It has a dry moat 10-11 meters wide and 6 meters deep, which allowed the barracks for soldiers and officers to be located on two floors. The two-story central building contains barracks, a hospital, a kitchen, a dining room, warehouses for ammunition, food, equipment and fuel, a guard room, a boiler room, workshops and auxiliary rooms.