Deep in the California Desert lies a spot known as Death Valley. But unlike ghost towns, dinosaurs, and other fossils one can find in the desert, in Death Valley rocks seem to have come alive.

For over a century, scientists have been puzzled by the famous Sailing Stones of Racetrack Playa; rocks that move on their own and leave beautifully smooth tracks behind. Some are upwards of 500 pounds and still travel more than 15 feet in a minute. Others leave trails that are thousands of feet long.

However, while it has been confirmed that the rocks do move without human or animal intervention, no one had ever seen them in action - until a pair of curious scientists finally got to the bottom of the mystery only a few years ago…