For decades, people have puzzled over Racetrack Playa in Death Valley, where hundreds of rocks weighing as much as 700 pounds roam across the surface of the dry lake bed.
News, Las Vegas Revew-Journal
Wed, 08/27/2014 - 1:24pm
For decades, people have puzzled over Racetrack Playa in Death Valley, where hundreds of rocks weighing as much as 700 pounds roam across the surface of the dry lake bed.