Check out these Castles! My husband, our son and I visited this castle in Slovenia quite by change of plans. We were to drive to Prague from Vienna, Bratislava, then onto Hungary. My husband and I flew to Vienna from Bahrain, and our son flew there from the States. The day we got there was the day Europe had the 100-year flood. All our well-made plans went out the window. We decided to keep the rental car and head south. In doing so, we went through Slovenia and discovered this wonderful castle built into the cave. It was awesome!
Extreme Castles: Predjama Castle, Slovenia – Bing Travel: “Extreme Castles: Predjama Castle, SloveniaA castle on an island is one thing, but a castle in a cave? Slovenia has just that in the form of Predjama Castle, built in the mouth of Postojna Cave, about 100 miles east of Venice, Italy. The in-cave location provided excellent defensive capabilities for the castle, whose history goes back at least to the 13th century; these days, cave tours are popular with visitors to the castle.”
via GOTTA TRAVEL.