Among the most interesting places to visit in Slovenia are the stunning underground caves, hosting a number of natural tourist attractions, such as the human fish (olm) of the world renowned Postojna cave, which features another one of the best tourist attractions in Slovenia, the unique underground cave train ride. In the Škocjan cave, that is listed among UNESCO’s natural and cultural sites, you can see the largest underground water canyon in the word. With over 10 thousand registered caves, some open and entirely accessible to tourist with disabilities, your visit to Slovenia must for sure include at least one subterranean wonder.