It is located at the beginning Otruševec village, 5 km from Samobor. The cave has two halls, a height difference of the inputs to the bottom is 19 meters long cave is about 30 m high stalactites. Over time it has built and installed electric lighting. At the entrance of the gate, and the key is in the inn "Cave," owner Joseph Grgosova, that is - digging for lime stones - 1973. years and discovered the cave. The wealth of speleothems (stalactites and stalagmites) contributed to Grgosova caves - the most beautiful caves of northwestern Croatian - already in 1974. Whatever. be declared a protected geomorphologic nature monuments.