Such caves are everywhere in the world. What's special about the Postojna Cave? There are two: 1. The part to visit is deep inside the mountain. Need to ride a dangerous train inside a tunnel for a few Km to get there. Kind of like Space Mountain in Disneyland. 2. There are olms on displayed inside the cave, poor amphibian which do not see light in the cave, thus with smooth and colourless skin and no eye.
