Discovered in 1940, the Lascaux Caves are home to over 600 ancient cave paintings that were completed by early humans. The paintings are estimated to be around 17,000 years old, and are the combined effort of many, many generations. They largely depict animals and local fauna that correspond to the Upper Paleolithic time period.
Initially, the caves were open to the public, but the carbon dioxide, heat, humidity, and other contaminants produced by 1,200 visitors per day had visibly damaged the paintings and they declared it closed. If you want to go see art, watch the Emoji Movie. Don’t bring your dirty human contaminants into precious ancient caves.