Cueva de Hornos de la Peña is an archaeological enclave of Cantabria with occupational levels ranging from the Middle Paleolithic to the Neolithic , for more than 30,000 years. It is one of the caves included in the list of World Heritage of Unesco since July 2008 , within the site "Cave of Altamira and Paleolithic Cave Art of Northern Spain " (in English , Cave of Altamira and Paleolithic Cave Art of Northern Spain ). 1