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Caves of Isturitz and Oxocelhaya 
Caves of Isturitz and Oxocelhaya A major prehistoric site in the Basque Country
Saint-Martin-d'Arberoue
Unique caves in the Basque Country listed as HISTORICAL MONUMENTS. Sites & Museums in the Basque Country - ISCA - ...
The Caves of Sare 
The Caves of Sare
Sare
An original exploration of the underground world! 20km from Saint-Jean-de-Luz, in the heart of a remarkable natural ...
La Verna cave 
La Verna cave The largest underground room in the world in Sainte-Engrâce
Sainte-Engrâce
Visit the largest underground room in the world open to the public! Tourist Cave / Speleological Adventures in the ...
