In September 1940, four boys and a dog set out on an adventure in Dordogne, France. Robot the dog ran ahead and stopped at an overgrown depression. When the boys decided to explore the hole, they slid into a deep underground chamber where they discovered the most famous cave paintings in the world- the Lascaux Cave Paintings. In this photo, Robot the dog with two of the four cave's discoverers.
The oldest footprint ever found, Kenya, one million five hundred thousand years old