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from Cracked.com

6 Abandoned Places That Will Make Awesome Supervillain Lairs

The Augarten Flak Tower- Vienna, Austria- one of several flak towers constructed by Hitler (literally -- he personally took part in designing them) in 1942 to act as combined bomb shelters and anti-aircraft battlements against the Allied forces -- a job they carried out so well that when the Soviets later tried to demolish them in peacetime, their explosives only hurt the surrounding buildings.

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from Inhabitat

World War II Flak Tower Transformed Into Tropical Aquarium in Vienna

Vienna | Haus des Meeres | An old WWII Flak Tower turned into a Zoo & Aquarium | http://www.haus-des-meeres.at/

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