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.