If you travel to Slovenia, a visit to the Postojna Cave is a must. The cave is really a fantastic web of naturally made tunnels, passages, galleries and caverns. The astonishing diversity of Karst features has made it the best-known cave in the world.
Predjama Castle in Postojna, Slovenia is an unusual medieval castle that was built in 16th Century in the mouth of a 21km cave system!   The original Gothic castle was built in 13th Century but destroyed in 15th Century.  

South Slovenia

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