The exiting part of Postojna caves visit is the train that runs two kilometers into the cave. And then you are taken by foot into the three sections of the cave.
Topmost section is called the great mountain. It is the highest point in the caves and if I remember right, it is 150 meters above ground level. This is the oldest part of the caves and reachable by an elaborate walk through te bridges sticking above huge deep gorges.
Then you are walked to the second level called te beautiful caves. These have sections with different names. You see the cave curtains hanging from the top with several feet in width and folding towards the edges like a drape or curtains.
Then you see the spaghetti caves which resemble fresh spaghetti of course .
The lowest level of the three sections is the youngest caves. These limestone deposits grow about 1 centimeter in 100 years or so.
And of course there is the couple deposits which are the poster image of Postojna Caves in Slovenia.
Stalactites are the deposits from the ceiling of the cave growing downwards
Stalagmites are the limestone deposits growin up from the floor of the cave
When the two of these meet, they form a cave column or a pillar
What fun stuff!
Cost of cave entry: 25 euros
Duration of visit: 2 hours
In my opinion, the visit is totally worth your time and money. Give yourself a Aha! Moment.