Postojna Cave & Predjama Castle Tour: Electric Train Ride

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Free cancellationTravelers' pick

1/10

Duration5h

GroupUp to 50

LanguagesEN · DE +1

PickupAt your hotel

The only preserved cave castle in Europe sits inside a cliff above an underground river.

A five-hour tour from Koper combines two sites: Postojna Cave, traversed by electric train past the proteus (olm) and vast karst galleries, and Predjama Castle, a 15th-century stronghold built into a vertical 123-meter cliff face. Your guide picks you up from your hotel, cruise terminal or station and handles entry to both; the cave stays at a constant 10°C year-round, so warm layers and sturdy shoes matter.

Step-by-step itinerary

Visit Postojna Cave and Predjama Castle

Pick up from Koper starting point
Explore Postojna Cave by electric train
See the proteus (olm) in the cave
Visit Predjama Castle on cliff
Learn about Erazem of Predjama legend

The Experience

The tour starts with pickup in Koper and heads to Postojna Cave, where you board an electric train that carries you through tunnels and halls carved over millennia. The cave is the largest karst monument in the world and has drawn more than 36 million visitors over two centuries. You'll pass formations the train route was built to reach, and you'll see the proteus — a blind, pale salamander that lives nowhere else — in its underground habitat. The train does the heavy lifting; walking the galleries on foot comes after.

Predjama Castle stands a short drive away, built into the mouth of a cliff in the village of Predjama. The structure has occupied that spot for over 800 years, and it is the only cave castle still standing in Europe. The Lokva River runs beneath it and disappears underground, which is part of why the castle was built there in the first place — medieval builders chose the cave entrance as a fortress. The 15th-century owner, Erazem of Predjama, held off a siege for more than a year from inside it, a story that still shapes how people see the place.

Your guide speaks English, Italian or German and manages the route, timing and entry to both sites. The cave temperature holds at 10°C regardless of season, so bring a jacket and closed-toe walking shoes even in summer. The tour runs five hours total from Koper, and the driver returns you to your starting point — hotel, cruise terminal, train station or bus station — at the end.

What’s included

Driver and live guide in English, Italian or German.
hotel, cruise terminal, train station or bus station pickup and drop-off in Koper.
entry to Postojna Cave with electric train access.
entry to Predjama Castle.
insurance.

Good to know

Moderate physical levelWheelchair accessibleAccessible transportStroller friendlyInfant seats availablePets welcomePublic transport nearbyInfants must sit on laps

Operated by KoperTrips.com

Is this one for you?Book this if you're on a cruise or have a fixed schedule—the guide coordinates both sites and transport in one five-hour block, so you don't need to plan separate logistics.