Postojna is a small city of 9000 inhabitants in the Slovenian mountains, located 45 km southwest of Ljubljana.
It lies along the motorway, about halfway between Ljubljana and the coast. The main reason to visit Ljubljana is the cave system, a 24km long karst cave which was created by the Pivka river. The city itself, while unremarkable, is clean and pleasant with hotels, shops and restaurants.
The Postojna cave is two million years old, but was first described in the 17th century by the historian Johann Weikhard von Valvasor. It was prepared in 1818 for the visit of Francis I, the first emperor of the Austria-Hungarian empire. After that the cave became a popular tourist destination. Cave rails were added in 1872, electric lighting in 1884.
Visitors enter the cave in groups, according to language, and visit the cave with a guide. An electric train brings visitors 3.7km into the mountain, after which the tourists walk for about an hour and a half along a defined 5 km long trail. The temperature in the caves lies between 8°C and 10°C the whole year. Inside the cave system there are spectacular rock formations (stalactites, stalagmites etc).
How to get to Postojna
Postojna can be easily reached by car. It also has a train station with connections to Ljubljana. The closest airport is the one in Ljubljana.
Being a major tourist destination in Slovenia, Postojna has a number of accomodation options (hotels, apartments etc.), most of them bookable via the international booking portals.