Postojna Cave (Postojnska Jama)
Discovered in the 17th century Postojna Cave is a beautiful natural phenomenon you have to visit if you are in Slovenia. The 24000 m long karst cave also serves as a home for almost 150 species, but the so called human fish (or olm) became the cave’s symbol. The cave system is 35 km long, but only 5 kms can be visited (with train and a part of the tour on foot). The train ride felt like railing inside Gringotts Bank! Inside it’s usually 5 degrees, so prepare yourself with warm clothes!
Here is a short footage of the train ride (it was faster than it looks!):
Predjama Castle (Predjamski Grad)
Half cave half castle is the accurate way to describe the renaissance style Predjama Castle, which is only 10 kms from Postojna. It’s not easy to reach though with all those mountain zigzags, but certainly worth a visit. It was built in the 12th century and was used as a robber fortress because of its location. Its climate is really cool in every season so it was not so fine during the winters. Its last owner was the Windischgräz family until the end of World War II. Fun fact is that it was a shooting place for a Jackie Chan movie, Armour of God.