Caves of Lascaux were found in 1940. Located in southwestern France, the caves were discovered by a young man named Marcel Ravidat. The caves contain about 2,000 paintings, which can be organized into three groups: animals, humans, and abstract creations. The caves were opened to tourists in 1948, but light, changes in air temperature, and carbon dioxide exhaled by humans took a toll on the works of art. The real caves were closed in 1963, and a simulation of the caves was opened nearby. Mold continues to be a problem. Children can visit the official (and amazing) website at: Caves of Lascaux.