Cave & Rock paintings are paintings found on cave walls and ceilings, and especially refer to those of prehistoric origin. The earliest such rock art in Europe dates back to the Aurignacian period, approximately 40,000 years ago, and is found in the El Castillo cave in Cantabria , Spain . The exact purpose of the paleolithic cave paintings is not known. ~ Wikipedia
It seems that folks have been painting on rocks for a long time! This bison is amazing ... it was found in the Cave of Altamira, near Santander, Spain.