The sailing stones of the Racetrack Playa in Death Valley California. Scattered about the desert are large rocks with mysterious trails left behind them. The trails show that these rocks have rolled and zig-zagged across the ground, sometimes for as long as 860 feet. Yet no one has ever seen the stones actually move. The trails last for years before fading, so it is almost impossible to predict when the stones will move or how fast they move.
Sailing stones The sailing stones, also known as sliding rocks and moving rocks, are a geological phenomenon where rocks move in long tracks along a smooth valley floor without human or animal intervention. They have been recorded and studied in a number of places around Racetrack Playa, Death Valley, where the number and length of travel grooves are notable. The force behind their movement is not understood and is the subject of research.