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.
uqLOOK - video of an astonishing work of art. One man, 100,000 toothpicks, and 35 years: An incredible kinetic sculpture of San Francisco by Scott Weaver. Multiple tours of the sculpture by ping-pong balls. Seriously, have a look.