Underground secrets. Hidden under the soil of the San Sebastian Region are a number of fascinating archaeological treasures that date as far back as 13,000 years. Prehistoric sanctuaries and fascinating examples of cave art lie just beneath our feet.
The Arditurri mines ran almost non-stop for 2000 years
An underground baroque cathedral created by the forces of nature
Exceptional displays of cave art from the Palaeolithic era can be seen in the galleries