At the Vienna museum of military history (Heeresgeschichtliches Museum ), we saw a funny "kugelbunker", a concrete boulder for one person shelter from the world war times.
There was also a hole. Probably not the best, if any protection...
See more urban exploration and caving stories at theurbanexplorer.net and planetcaver.net, and see other articles by the Planetskier at Blogspot and TGR! Photos and text (c) 2019 by Jari Arkko. All rights reserved.
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