https://www.history.com/this-day-in-history/lascaux-cave-paintings-discovered?cmpid=email-hist-tdih-2020-0 [login to see] 0&om_rid=
Near Montignac, France, a collection of prehistoric cave paintings are discovered by four teenagers who stumbled upon the ancient artwork after following their dog down a narrow entrance into a cavern. The 15,000- to 17,000-year-old paintings, consisting mostly of animal representations, are among the finest examples of art from the Upper Paleolithic period.