Predjama Castle, Slovenia: Visiting the World’s Largest Cave Castle With Kids

Predjama Castle in Slovenia is one of Europe’s most extraordinary fortresses — dramatically built into a 123-metre-high cliff and officially recognised as the largest cave castle in the world. If you’re planning a family trip to Slovenia, this is one stop that feels straight out of a fairytale (and a bit of a movie set!). Here is all you need to know about visiting Predjama castle with kids.

The largest cave castle in the world.

Why Visit Predjama Castle?

Located a short ride away from the Postojna cave is the largest cave castle of the world – Predjama castle. The castle looks right out of a fairy tale! Listed in the Guinness World Records as the largest cave castle in the world. It can be visited in continuation with Postojna cave as a day trip from Ljubljana. You can combine both in the same day — one of the most popular combos for family travellers in Slovenia.

Check out their official website for more information PREDJAMA CASTLE.

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Set against the backdrop of mighty mountain and intercommunicating caves, the 800 year old castle was very cunningly constructed to survive seige and also to provide escape to its inhabitants if needed.Half fortress, half cave — the castle merges with the mountain, creating secret tunnels and hidden chambers kids will love exploring.

the inhabitants must have definitely enjoyed great views!

The audio guide is included in the ticket charge. One of the best audio guide that I have experienced – it is informative, precise and extremely entertaining. Gives a close peek into the lives of the people from that era.Easy to walk through and stroller-friendly areas.

Highlights Inside the Castle

The tour takes you around the castle's several rooms – kitchen, bedroom, dinning room, torture room, arms room and also to the back of the castle to a well shielded emergency exit through the caves.

• Erazem’s Tunnel: A secret passage once used for escaping and smuggling food.

• Medieval living quarters: Gives kids a real peek into castle life.

• Cave sections: Cool, dimly lit areas that feel like walking inside a natural wonder.

• Panoramic viewpoints: The cliffside views are absolutely stunning for photos.

the winding caves behind the castle providing secret exit

Erasmus, the most famous owner of the castle, survived a long seige in the castle till he was betrayed by his own servant and killed by a cannon shot in his own lavatory.

Best Time to Visit

The castle is open year-round.

• Summer (Jun–Sep): Longer hours, good weather, more crowds.

• Shoulder months (Apr–May & Oct): Fewer tourists, pleasant temperatures.

• Winter (Nov–Feb): Quiet and atmospheric.

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How Much Time Do You Need?

Around 1 to 1.5 hours inside the castle.If combined with Postojna Cave, plan 3–4 hours.

How to Reach

Predjama Castle is located 9 km from Postojna, about:

• 45 minutes from Ljubljana

• 1 hour from Piran

• 1 hr 15 mins from Lake Bled

Parking is available right near the entrance.

By the time you finish the tour of the caves and castle , you will be famished! A good place to eat a meal and rest the tired feet is a restaurant right at the entrance of the cave – Gostilna pozar B.

Try their turkey with mushroom sauce or gnocchi in mushroom sauce (vegetarian option) and gulp it down with some Lasko (not if you are going to be driving).

We tried their homemade berry ice-cream and vanilla ice-cream with pumpkin seed oil – oh so yumm!

Important to remember:

• Predjama castle can be a day trip from Ljubljana and can be combined with a visit to the Postojna caves. Combined ticket can be purchased.

• You may also plan to include a visit to Piran on the same day if you start early.

• Carry snacks and water along.

✅Looking for a unique stay? Check out our favourite farm stays in Slovenia — peaceful, affordable, and perfect for kids - Farmstays in Slovenia – Tried and Tested by Passport Cubs

✅Still choosing between European destinations? Read 7 Reasons Slovenia Should Be on Your Family Travel Bucket List— especially if you love nature, safety, and slow travel with kids.

FAQs About Predjama Castle

1. Is Predjama Castle worth visiting with kids?

Yes. The secret tunnels, cave rooms, and cliffside setting make it a fun and easy stop for families.

2. How long do you need at Predjama Castle?

About 1 to 1.5 hours. If you combine it with Postojna Cave, plan 3–4 hours total.

3. Can you visit Predjama Castle and Postojna Cave on the same day?

Yes. They’re only 9 km apart, and combo tickets are available.

4. Is the castle stroller or toddler-friendly?

Partly. Some steps are uneven, but lower areas are accessible. A baby carrier is helpful.

5. Do you need to book tickets in advance?

Recommended in summer, especially if you're visiting both the cave and the castle.