The estimated age of this cave, which can be reached from the centre of Fužine by travelling 3 km along the road by Lake Bajer, is between 3.5 and 4 million years. The total length of all the channels in the cave is 300 m, of which about 250 are open to the public.
A guided tour takes about half an hour. At the end of the cave, there is a spring, which is why during periods of rain this cave abounds in water. This fact, in addition to its abundance of cave formations, makes Vrelo Cave very attractive to visit. The cave is illuminated along its entire length, and thanks to the almost completely even path without stairs, a tour is also suitable for people with disabilities. The air temperature in the cave is 8°C throughout the year.