1) Slovenia is known best for its beautiful mountains and forests, but below the surface it hides a magical secret...

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2) Under the ground there's miles and miles of secret and sparkling caves

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3) You can sail down subterranean rivers...

A photo posted by Lou Boyd (@loukayboyd) on

4) Catch a cave train...

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5) Or just cross your fingers and abseil into the abyss....

A video posted by Lou Boyd (@loukayboyd) on

6) ...Where you might find a (little) cave dragon

7) Here- being a cave explorer is a real job!

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8) And explorers spend weeks underground without coming to the surface, finding undiscovered caves

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9) It has the biggest, most badass castle- that isn't exactly what it seems...

A photo posted by Lou Boyd (@loukayboyd) on

10) Go through these gothic gates and you'll discover  secret passages descending 150m down into the ground...

Entrance to the Postojna Cave #postojnacave #postojnskajama #followme #slovenija #travel #traveling #TagsForLikes #TFLers #vacation #visiting #instatravel #instago #instagood #trip #holiday #photooftheday #fun #travelling #tourism

A photo posted by Postojna Cave - Grotte - Hӧhle (@postojnacave) on

11) You might find a secret  ballroom....

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12) Go to an undeground gig ...

13) ....On the other hand, you could find yourself in a torture chamber

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14) But this place changes within hours. You could arrive in a medieval village and forest...

A photo posted by Lou Boyd (@loukayboyd) on

15) And by the time you come out of the caves the medieval village might have been replaced by a winter wonderland!

A photo posted by Lou Boyd (@loukayboyd) on

Getting there:

Wizz Air fly to Slovenia from £90 return.

Visiting the castle and caves:

Explore Postojna Caves with tickets starting at €22.90