I’m a prehistory nerd designing a trip through northern Spain w my husband, focusing in part on cave art and symbols. I understand Altamira only has the reconstruction open, but I believe El Castillo and a few other caves allow visitors to see the real thing. Several years ago I hired a private tour guide recommended by Rick when I visited the caves in the Dordogne and it was a lifetime travel highlight for me, but I haven’t found similar recs for Spanish cave guides. Anyone here in the forums have recommendations? Thanks y’all!
EDITED TO ADD: To be clear, I am looking for recommendations for individuals or tour companies who conduct private tours of caves in Northern Spain, not general information about which caves to visit.