Ula W.
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It’s a paid guided tour inside the cave, lasting around 30–40 minutes. We took the 16:00 tour, and it seems that in winter, tours run every full hour.
The cave itself is a fascinating place—well preserved, with a knowledgeable tour guide who provides interesting information in multiple languages. Our group received explanations in English, Spanish, and German. Overall, it was worth the €14 per person. Plus, the views from the café where you can wait for the tour are absolutely breathtaking!