Postojna Cave

Staying on the topic of caves, around the corner from Predjama are the Postojna Caves. The caves were created by the Pivka River. Before you enter the caves there is an old mill with a mini museum included.

In 1819, Archduke Ferdinand visited the caves and this is when it became a tourist destination. Today it is set up with a train and walkway system to make the caves easier to visit. 

When you take the tour they explain the different parts of the caves and why certain colours are more prominent than others and so on. I have to admit, once again, this information escapes me so many months later but it is definitely worth checking out!