In the middle of Death Valley, there is an incredibly dry lakebed called Racetrack Playa, and it is there that one of the strangest natural phenomena occurs. According to locals and experts alike, it the dead of night, the hundred-pound stones that can be found scattered about the ground mysteriously shift hundreds of feet. So what's moving these massive rocks? A team from the Scripps Institution of Oceanography believe they finally have the answer.
http://www.natureworldnews.com/articles/8759/20140827/mystery-sailing-stones-unveiled-death-valley.htm