Even NASA cannot explain it. It’s best to gaze in wonder at the sliding rocks on this dry lake bed in Death Valley National Park. Racetrack Playa is almost completely flat, 2.5 miles from north to south and 1.25 miles from east to west, and covered with cracked mud. The rocks, some weighing hundreds of pounds, slide across the sediment, leaving furrows in their wakes, but no one has actually witnessed it.
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.
Planetary alignment of Venus, Mercury, and Saturn with the Giza Pyramids in Egypt. This phenomenon only happens once every 2,373-years and the next event is set for December 3, 2012, at one-hour before sunrise.