The Altamira Museum is 2 km from the Santillana del Mar city centre. This is a natural cavity in the rock where Prehistoric drawings and artistic remains are preserved with great quality, and are considered the most important remains in the world. Some time ago the caves could be visited in their entirety, but due to deterioration access was restricted and new installations were built next to the original caves, the Altamira Museum and the Neo-cave, a meticulous and detailed replica of the original.