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Flak towers (German: Flaktürme) were large, above-ground anti-aircraft gun blockhouses used by the Luftwaffe to defend against Allied air raids on certain cities during World War II. They also served as air-raid shelters for tens of thousands of people and to coordinate air defence. After the RAF's raid on Berlin in 1940, Adolf Hitler ordered the construction of 3 massive flak towers to defend the capital from air attack. These towers were each supported by a radar installation that had a retractable
