Used as an anti-aircraft tower and as an air-raid shelter in WW2. 10 floors. 47m high. Depth of the concrete walls: 2.5 m. Ceiling: 3.5 m. Today, the tower accommodates the “Haus des Meeres” (House of the Sea) aquarium. The tower belongs to the combat towers of the military barracks area known as “Stiftskaserne”.