Postojna Caves, Slovenia
These caves are well worth visiting, and are available as an excursion from Croatian travel agents.
posted by Colin G at 11:05 am
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Subterranean History: Forts, Bunkers, Coastal Defence Batteries, Air Raid Shelters, Mines and anything else underground.
Featuring: Dover's Western Heights, Medway defences, The Needles Passage, Plymouth, East Wight Defences, Thames Estuary forts, Portsdown Hill Forts, Welsh Mines, Maunsell Army & Navy Forts, London Mobilisation Centres, Nord Pas De Calais defences, Public & Military Air Raid Shelters, Cold War ROTOR bunkers, ROC Posts and many more.