grantoury
Kona Fan
Not quite a bunker, but fitting for this thread nonetheless, I think. An air watchtower. Used in the fifties and sixties to watch the sky for Russian warplanes. This one is located seven km near my home, and someone I know has lived near it all his life, according to him it was never in use. Others say they were definitely manned. All of the online info is in Dutch, but here is the official website anyway.
https://luchtwachttorens.nl/
https://luchtwachttorens.nl/
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