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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.

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 |