Cave under Predjama Castle

What it is

Under Predjama Castle opens a cave of four floors and 14 km of known galleries: the park presents it as the second-longest tourist cave in Slovenia. All levels are connected except the highest, the Hole and Erazem's Passage, named after the castle's robber knight.

Unlike Postojna, there is no electric light here. You are given a torch before going in and you go with the guide on a route of about 700 m. It is a simpler visit and more about exploring: natural ground, darkness and the silence of a cave with no train or spotlights.

What you see

The path passes through the Stables, the entrance, where remains from Roman times appeared; the Main Corridor; the Cave of Names, with signatures going back to the sixteenth century; the Great Hall; and Fiženca, where you emerge on the surface. Archaeological finds show that people lived here from the Stone Age. The visit covers the two upper levels and lasts about 45 minutes.

A colony of bats lives in the cave. That is why it is closed during their hibernation and only opens in summer.

Season and opening hours

According to the park's official timetable, there are visits from May to September:

• May and June: one departure a day, at 11:00.
• July and August: at 11:00, 13:00 and 16:00.
• September: until the 25th, at 11:00 on weekdays, and also at 13:00 and 16:00 at weekends and public holidays.

Outside those dates, only by prior arrangement. The castle's page speaks of opening from June to August; the timetable and cave pages say May to September. Confirm the date when you buy.

Tickets and price

The ticket costs €24 in the online shop of Postojna park, which also manages the castle. With few departures a day, it is best to buy beforehand, especially in July and August. For packages with the castle and Postojna Cave, see tickets.

If you are after something more serious, the park organises adventure visits to the closed passages, with three levels of difficulty, narrow passes and watery stretches, in small groups and with equipment included. They are requested by email at [email protected].

What to bring

The park recommends comfortable clothes and shoes; choose something you do not mind getting dirty, because the ground is natural. It speaks of pleasant temperatures but gives no figure: bring a layer in your backpack. The torch is provided there.

How to get there and park

The entrance is at the foot of the castle, in Predjama, 9 km from Postojna Cave along a local road. In front of the castle there is paid parking, at €3 an hour. The shuttle from Postojna is listed in November 2026 as temporarily out of service.

With children, pushchair or dog

The park says the two levels of the visit are easy for children from age six, and does not recommend it for younger children or people with difficulty walking. Pushchairs and wheelchairs cannot get through. Dogs cannot enter any cave in the park.