Postojna Cave is  the most famous attraction in Slovenia. Easy reachable by sight viewing road with only 90 minutes drive. Witness a fantastic web of caves, passages and galleries of this unique Karst phenomena. Inside the park you can also visit the Predjama Castle perched in a vertical cliff.

Note: Passport required

 Photo By Leandro Neumann Ciuffo from Rio de Janeiro, Brazil (Souvenir shop inside the cave Uploaded by Sporti) [CC BY 2.0 (], via Wikimedia Commons