Here in Vienna, Austria there are a lot of old Nazi Flak Towers very very close to the Downtown of Vienna...they are still there intact since the end of WW2 (except one who was turned into BIG Aquarium) i really like that City didnt destroy them and that they are still there, like an living Museum for all of us i took a ride with my Bike few Months ago and filmed one of them (there is another one just 400m away from this one, but at that time i didnt know and i didnt see it from the trees) Here you can find all 6 of them located in the City Wiener Flaktürme – Wikipedia