The Postojna Cave—a subterranean wonderland of karst tunnels, caverns, and galleries, adorned with dramatic stalagmites and stalactites—is one of Slovenia’s most remarkable natural wonders and among the country’s most visited tourist attractions. It stretches along the Pivka River for an impressive 12.5 miles (20 kilometers).
Visitors can discover the underground world of Postojna Cave on a 1.5-hour guided cave tour, which includes a ride on an electric train and an 0.9-mile (1.5-kilometer) hike through cave areas such as the Great Mountain, the Concert Hall, and the Brilliant Passage. Full-day Postojna Cave tours run from Ljubljana, Koper, and Bled, as well as from Zagreb or Rovinj in Croatia, and are often combined with nearby attractions such as Predjama Castle, Lake Bled, or the Skocjan Caves.
Things to Know Before You Go
Guided tours are available in four different languages and audio guides are offered in 17 languages.
Temperatures inside the cave average 45–50°F (8–10°C) even in summer, so it’s recommended to bring warm clothing and wear comfortable walking shoes.
There is a hotel (Hotel Jama), gift shop, and restaurants onsite.
Postojna Cave is accessible for wheelchairs and strollers.
How to Get There
Postojna Cave is located 34 miles (55 kilometers) southwest of Ljubljana, about a 50-minute trip by road. The easiest way to visit is by private car or as part of a guided tour, but it is also possible to arrive by public transport—buses from Ljubljana stop close to the Jama Hotel, while train services connect to Postojna town (1.2 miles or two kilometers away).
When to Get There
Postojna Cave is open year-round, but the most popular time to visit is between May and October, when tours are held hourly. Winter sees fewer crowds, but it’s best to book ahead as there are sometimes only four interior tours per day.
Highlights of the Postojna Cave Park
After exploring the beautiful caves, pay a visit to the nearby Predjama Castle, the largest cave castle in the world. Then, visit the Proteus Vivarium to discover the large number of animals that dwell in the caves, including the famous olms or “baby dragons.” Other highlights include the EXPO Postojna Cave Karst, an exhibition on the cave’s unique karst landscapes, and adventure tours of the neighboring Pivka Cave and Black Cave.