Alvados caves, Serras de Aire e Candeeiros Natural Park, Leiria, Portugal.

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Photo credit: © HEITI PAVES/SCIENCE PHOTO LIBRARY / Alamy / Afripics
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Keywords: -, aire, alvados, candeeiros, cave, de, formation, geological, geology, grotto, grottoes, natural, park, rock, serras, souterrain, speleologist, stalactite, stalagmite, underground