I'm a simple emigrant, and I'm in shock

Not far from me there is a large park, and we go there to walk very often. And every time we pass by there, I can't take my eyes off one building that's in the photo. First, it's simply creepy, because it sits abandoned among pretty, beautiful houses; second, what are these doors with peepholes in the windows, and anyway, what size are the windows? My vivid imagination immediately pictures: "what if someone was kidnapped and kept there on a chain." And given Germany's history, there are countless options for using creepy buildings. I've already asked a bunch of German friends and googled, but the mystery of the abandoned house remained shrouded in darkness. Now I was gathering material for something else and came across the photo of this very building, surrounded by others like it. There are already guesses about what it is? I won't keep you waiting: it's a bunker! And in Frankfurt there are at least 23 more of them. Some bunkers have been converted and are now used as a warehouse, a bar, and even a kindergarten, but most remain abandoned. Such an unusual system of above-ground bunkers could have saved civilians during carpet bombings. It's not unlikely that, thanks to these shelters, the death rate from bombings during World War II in Frankfurt was only 1%, whereas in other German cities it was many times higher. For example, Berlin 2.5%; Cologne 3.5%; Darmstadt 10.9%; Dresden no less than 12%. The truth turned out not to be pleasant either, but better that way than if I kept coming up with variants. Check out in the comments a map of Frankfurt's above-ground bunkers. #frankfurt #history