Domica Cave, a UNESCO World Heritage Site, is a must-see tourist attraction. It is about 20km long, three quarters of this length being Hungarian. After walking around the lakes and waterfalls, you can go down the Styx River by boat (if the water level is high enough). Among the many archaeological discoveries made here, the oldest comb in Europe is testament to the presence of prehistoric man. And with its 16 species, Domica boasts the largest bat colony in Slovakia.