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One of WWII flak towers in Vienna, (walls up to 3.5 m (11 ft) thick). After the war, the demolition of the towers was often considered not feasible. Solid infrastructure. : r/InfrastructurePorn
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One of WWII flak towers in Vienna, (walls up to 3.5 m (11 ft) thick). After the war, the demolition of the towers was often considered not feasible. Solid infrastructure. : r/InfrastructurePorn
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