A well-pre­served defen­sive struc­ture of Kalin­ingrad. The area is 350x180 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.