Postojna Cave
Postojna is Slovenia's main tourist attraction and the world's most famous cave.
Postojna with its web of tunnels is home to a neotenic animal olm or the human fish. You can take a ride on a train through the cave and actually, Postojna is the only cave in the world that offers that type of an adventure.
Close to the cave is the Predjama Castle from the 16th century which blends with another karst cave giving the feeling that the castle is about the be eaten by the cave itself.
