The Sliding Rocks of Racetrack Playa
No one knows how they move, but there’s a trail of evidence that the rocks in Death Valley National Park creep their way across Racetrack Playa without any human laying a finger on them. 

The Sliding Rocks of Racetrack Playa

No one knows how they move, but there’s a trail of evidence that the rocks in Death Valley National Park creep their way across Racetrack Playa without any human laying a finger on them.