Located in one of the flattest places on the face of this planet are the strange and unexplained Sailing Stones of Racetrack Playa, Death Valley, California. Once a year the "Playa" or flat desert pan experiences short winter rains and becomes slippery as the hexagonal desert floor turns back to mud. During this time the boulders and rocks move leaving clearly visible tracks behind them.
Sailing stones, sliding rocks, and moving rocks all refer to a geological phenomenon where rocks move in long tracks along a smooth valley floor, known as Racetrack Playa, without human or animal intervention.
30 Natural Phenomena You Won’t Believe Actually Exist - Sailing stones in Death Valley, USA: a geological phenomenon where rocks move and inscribe long tracks along a smooth valley floor without human or animal intervention.