Is this the oldest known work of art on the planet? Experts reckon it's at least 42,000 years old. That's so old that it may have been made by a Neanderthal, rather than by an early human. It was found inside the Nerja Caves in Nerja, Andalusia, southern Spain and is thought to represent seals. I'm not sure how it is supposed to have survived the continual formation of the stalactite it was drawn on. The Nerja Caves have their own website (title link).