The cave is really nice but the mandatory tour is only in Slovakian language so we didn't understand anything and the group was really too big even if we were in the low season. The entrance fee (7 euros) makes it very expansive. We buy our ticket in English and the guy didn't tell us that the tour was only in Slovakian language. The cave is not natural because they made some construction for the tourist so you can see a lot of thing broken.So, we felt that the people were not respectfull about the cave's environment. There are a lot of cave in Slovakia so we are 100% sure they are other caves. Finally, if you want to take picture you have to pay 10 euros. Classical tourist trap!