Located in the Sierra de Arnero, about 85 km from Santander you will discover these magnificent cave systems which were discovered in the early twentieth century. These caves are fantastic geological wonders which can be explored on a mining train which will take your group through the mining gallery. For the more intrepid and daring, there is an underground 2,5km route allowing you to explore the cave in its natural state, including stalactites, stalagmites and columns.
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