Ice circles are a natural anomaly known to rarely occur in very cold climates. Scientists speculate that they are formed from whirlpools that rise to the surface and then freeze in the shape of a perfect circle. The largest reported ice circle was measured at 150 meters in diameter.
Walking Rocks! 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.