Most of the underground is not easily accessed, but we have more than 20 caves that can be visited easily and a few mines that offer tourist visits as well. Of those I chose three experiences that I have experienced and are my favorites.
In the cave you can't see elm or Proteus or - as Slovenians call it - human fish, but it has many other species that are easily spotted there. Krizna jama Cave with its biological diversity is considered to be the fourth largest known ecosystem in the world. And this is not all. In the cave you can see many signatures from people visiting it in the past - this is now of course strictly prohibited - but we are lucky that was not the case before, as the oldest signature here is from 1557.
We've entered through Pivka Cave, crawled into the Black Cave, did a few riddles, got ourselves a key and entered through the fence into the most beautiful parts of empty Postojna Cave. On our way we were accompanied with expert spelunker guide that had answers on all of our many questions.
For everyone that has been already in the Postojna Cave it is easy to understand why a walk through empty halls is truly special. We've exited the cave on a famous and the only cave train in the World. You think the train is new? You are wrong, as rails for the train in the cave were set approximately 150 years ago.
We've visited the mine with former miner that knew everything there is to know. The experience is completely different than in caves as this was man made and it is completely safe.
The first part is a bit claustrophobic as you enter the mine on the same little train that was used for caring miners to the underground. After changing your clothes for water proof pants you descend walking on a narrow staircase to the bottom, which is approximately 700 meters bellow the mountain Peca, where kayaking begins.