The FLAK towers in Augarten are fenced off with 2 metre high fences, there are other FLAK towers in Vienna, and I believe that one has been turned in to an aquarium! The eldest son (who lives in Vienna) is visiting us at present and he told us that the locals hate the FLAK towers as they are reminders of the war, they can't be demolished as they are listed buildings, so the authorities are leaving them to the elements.