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Photo: Niels Elgaard Larsen, CC BY-SA 3.0 via Wikimedia Commons
Cold War museum, in former fortress dug into the white chalk cliffs of Stevns. There is free access on the surface, but you have to take a guided tour to go underground
© OpenStreetMap contributors
Museum of Geology on the edge of Faxe Chalk quarry focusing on chalk, minerals, and the ancient coral reefs