These three enormous flak towers guarded a German Marine base near Angers, France. Each tower would have been armed with several large caliber and small caliber anti-aircraft guns. They were destroyed by Allied air attacks as General Patton’s 3rd Army advanced East.
Flak Towers:The L Tower in Vienna is now, well, you take a guess. If your German is any good then its current name – Haus des Meeres is a complete giveaway. If not, then you may be surprised to discover that it is an aquarium
Nazi Flak Towers like this one have 10ft thick walls and were used to defend the Reich