The Racetrack is one of the most famous landmarks in Death Valley National Park and home to the world-famous “moving rocks”. The Racetrack is actually a playa, or ancient lake bed. The hard-packed mud surface is incredibly flat and becomes unbelievably slick when wet. It is theorized that the “moving rocks” fall from the nearby mountain ranges onto the playa floor. Later, these rocks are thought to be pushed by high winds when the playa floor has been soaked by winter snows and rains. The tracks left by these rocks prove that they do indeed move, but no human eyes have ever witnessed the event.