https://www.mentalfloss.com/article/646388/human-evolution-discoveries
6. LASCAUX CAVE PAINTINGS // MONTIGNAC, FRANCE
In 1940, a group of teenage boys stumbled upon a cave filled with prehistoric artworks. The boys were so moved by the art that they camped outside the cave for a week just to protect the paintings inside. Eventually, they told a trusted teacher about their find—which turned out to be one of the most important discoveries in the history of art. The extensive paintings of bulls, deer, and other prehistoric animals are estimated to be about 17,000 years old and demonstrate that Stone Age peoples grasped the complexity of figurative art.