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Flak towers (German: Flaktuerme) were 8 complexes of large, above-ground, anti-aircraft gun blockhouse towers constructed in the cities of Berlin (3), Hamburg (2), and Vienna (3) from 1940 onwards. They were used by the Luftwaffe to defend against Allied air raids on these cities during World War II. They also served as air-raid shelters for tens of thousands of people and to coordinate air defence. In particular the G tower (German: Gefechtsturm) or combat tower, also known as the gun tower, battery tower or large flak tower is located in the Viennese Augarten park.