Sorry, this is not a "Bunker"!
It's only one of the entries of an old mine for baking oven stones. The mine has been closed years ago because it's a dangerous structure which could collaps at any time. Today it's an importand hibernation-site for bats. The slots you can see are for the bats.
Look at http://www.ofenkaulen.de for further informations.
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Photo taken in Königswinter, Germany
Misplaced? Suggest new location