Were discovered during the construction of Lika 1924th year and found them to track builder Nikola Turkalj. They were named after the railway station Cerovac. These caves are one of the biggest cave bears in Croatia, were found fossilized human bones and a bronze ax. This human bone belonged to the so-called. "Catcher in the cave bear" from the Late Pleistocene who lived there about 20,000 years ago. Length of the cave is 3,800 m, and the whole system of 4 kilometers. The upper cave is 1,295 m long and 2,779 m below between them is much smaller, Middle Cave. The average temperature in the caves of 11 ° C. Rich in cave decorations and karstic features (sinks and chimneys), significantly paleontological site of cave bears and prehistoric pottery (Illyrian - Celtic culture). As geomorphological natural monument protected in 1961. as a "special geomorphological reserve."