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Interesting especially for speleologists, there are around 250 known caves, usually 20-30m long - but some up to hundreds meters long.
Gombasec
Jasov
A small, approx. 45 minutes long, but unique cave. "Decorated" with aragonite formations—only 3 such caves were discovered so far in the world. Closed November-March.
Frozen all year long, this freely accessible cave is lowest altitude ice cave in Europe. Going outside the designated path is prohibited. The cave lies up a small flat hill in a picturesque nature that is worth seeing on itself.