Nazi Flak tower. Used against allied aircraft in Europe. They had an air defense range of 14km and could put up 8,000 rounds in a minute!!!

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The 350-strong garrison of the Zoo flak tower finally left the building. There was sporadic fighting in a few isolated buildings where some SS troops still refused to surrender, but the Soviets reduced such buildings to rubble.

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Berlin WW2 German flak tower - there were three of these giants in Berlin,the Soviet tank guns could not dent them. They held thousands of Berliners and were surrendered at war's end.

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The demolition of Berlin’s Zoo flak tower, known in german as the Flakturm Tiergarten, Zoo Tower.

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WW2 Bunkers-The Subject Of Contemporary Controversies And Urban Conversions -

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Knock John sea fort, one of several floating "Maunsell Forts," located in the Thames Estuary off the coast of England. Description from I searched for this on

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