If you visit Slovenia, there is absolutely no way that you won’t come across a poster or someone who suggests or rather persuades you to visit Postojna cave. Many might say that the attraction is over hyped.
Postojna cave system is massive in size, and one of the richest in stalactites, stalagmites, pillars, curtains, etc. The reason that it is so talked about is the fact that it has been made very accessible to tourists. There are multiple restaurants at the location, numerous gift and souvenir shops and much more. Apparently, from the outside it does not look at all like the entrance to a cave. Although these things will be a major turnoff for adventurers or cavers, most tourists are quite happy about it.