Postojna Cave and Predjama Castle Tour from Ljubljana

Postojna Cave, Slovenia's most visited cave

Postojna Cave is the centrepiece of this Postojna Cave tour from Ljubljana. More than twenty kilometres of passages have been mapped, and visitors have been coming since the early nineteenth century. You board a small electric train that carries you several kilometres into the hill, then continue on foot with a guide through halls of stalactites, stalagmites and thin rock curtains. The Concert Hall, big enough to host performances, and the white column known as the Brilliant are the best-known stops.

The cave stays cool all year, so bring a jacket even in July, and wear shoes with grip because the paths can be damp. People often ask whether Postojna Cave is worth visiting; for anyone who has never seen a large show cave, the answer is yes. Your ticket is already included, and skip-the-line access saves time at the entrance.

Predjama Castle, the fortress in the cliff

Predjama Castle stands in the mouth of a cave halfway up a 123-metre cliff, about nine kilometres from Postojna. A fortress has stood here since the thirteenth century, and most of the present buildings date from the sixteenth. It is best known for Erasmus of Predjama, a knight said to have raided the surrounding lands and sheltered here until a siege ended his career in 1484. This Predjama Castle tour is self-paced with the audio guide that is included.

Inside you walk through furnished rooms, a stone kitchen and the passages that connect the castle with the cave behind it. Plan on about an hour. The best photo angle is from the meadow below the cliff. Predjama Castle opening hours change by season, which is one reason our driver-guide sets the timing of the day. Children who like knights and secret tunnels usually rate it the highlight.

The Karst plateau and the road from Ljubljana

Postojna lies roughly fifty kilometres south-west of Ljubljana, about 45 minutes by motorway. Visitors often ask how to get to Postojna Cave without a car; public transport exists, but linking the cave with Predjama Castle by bus is slow. A day trip to Postojna Cave with pickup covers both places in one loop and leaves you free to enjoy the scenery.

On the way you climb onto the Karst plateau, the limestone region that gave the world the term karst. Your driver-guide explains how rainwater dissolved the rock, why the area is full of sinkholes and how caves like Postojna formed. It makes the visit clearer once you are underground and looking at the formations.

Best time to visit and how long to plan

Both sights are open all year, and the temperature inside the cave stays the same whatever the weather outside, so Postojna Cave in winter is as comfortable as in summer. Summer is the busiest season, when skip-the-line access helps most; spring and autumn are calmer. The morning departure suits an early start, while the midday departure works if you prefer a slower morning.

Allow about six hours in total, including the drive, the cave, the castle and time for photos. Meals and drinks are not included, so bring a snack or buy something near the sights. Best time to visit Postojna Cave is simply whenever you can fit the day in; the cave itself does not depend on the weather.