Predjama Castle, Slovenia. A castle, in a cave, under a cliff. Genius!
donotgogentlytravel.com/predjama-cas...
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Predjama Castle:
Castle (built directly into a rocky cliff face) and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

www.atlasobscura.com/places/predj...

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