Slovenia has a lot of caves, ranging from the mainstream tourist extravaganza of Postojna to the fragile Križna Jama, but the cavernous theatres of Škocjan give it a leg-up on the competition. A Unesco World Heritage Site since 1986, this gargantuan expanse is arguably the most significant limestone cave in the region, with biological importance allied to careful tourism and local respect. People have been coming to gawp since the beginning of the nineteenth century, and tours are conducted in a wide variety of languages.