Predjama Castle, the epicenter of the Slovenian wisdom?

Predjama Castle seems to have been built in a cave on a cliff to plan for earthquake drainage. The view from outside the castle is much more beautiful than the inside of the castle. I also attached a view of the town from inside the castle. It was easier than I thought to get to Slovenia. Seoul - Croatia Zagreb Airport. (You can buy cheap flights if you check Trip.com.) Rent a car at the airport and check if you can cross the border when renting. It is a little cheaper if you book a package with Predjama Castle and Postojna Cave. You can enter Predjama Castle without waiting, but you must make a reservation for Postojna Cave. We reserved a time for Postojna Cave and went to see Predjama Castle first, then Postojna Cave.