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https://postojnsko.si/travel/wp-content/uploads/2023/05/cave-under-predjama-castle-visit-postojna-4-1024x682.jpg1024682Under Predjama Castle, above and behind it, there is an interesting intertwining of karst caves. The most important of them is the cave under Predjama Castle, which is the second longest tourist cave in Slovenia, and extends over four floors – except for the uppermost Erazem’s hole with the tunnel, they are all connected to...