Underground Wonders & Castle Visit with Ljubljana Tourism
Difficulty
easy
Duration
5–6 hours
Fitness Level
Suitable for most fitness levels; requires standing and walking on uneven surfaces.
Overview
Journey beneath Slovenia’s surface on Europe’s only tourist cave railway, then visit a fortress built into a cliff. Discover why Ljubljana Tourism’s Postojna Cave and Predjama Castle trip is a must-do day adventure.
Adventure Tips
Dress in warm layers
The cave maintains a steady 10°C; bring jackets and comfortable shoes for walking on uneven surfaces.
Reserve your spot early
Tours run daily, but limited group sizes mean early booking ensures availability.
Bring a camera with low-light capability
Flash photography is prohibited inside the cave; a camera that handles low-light is ideal.
Prepare for moderate walking
Expect a mix of walking on gravel floors and stairs when touring the castle and cave pathways.
Local Insights
Wildlife
- Olm (Proteus anguinus), a rare aquatic salamander found only in underground waters here.
- European honey buzzard, occasionally spotted soaring near the castle cliffs.
History
Predjama Castle dates back to the 13th century and was the legendary home of knight Erasmus, known for his rebellious acts against the Habsburgs.
Conservation
Postojna Cave and Predjama Castle are carefully managed to balance visitor access with protection of fragile underground and historic environments.
Frequently Asked Questions
Recommended Gear
Insulated jacket
Keeps you warm inside the consistently cool cave environment.
all specific
Comfortable walking shoes
Provides stability on gravel floors and stone steps in the cave and castle.
all specific
Headlamp or flashlight
Useful for outdoor areas near the cave but not needed inside the guided tour.
all specific
Rain jacket
Protects from rain showers common during shoulder seasons.
spring|fall specific