Moving rocks on the Racetrack Playa in Death Valley National Park, CA. We took a trip out to Death Valley Christmas day and arrived at the Playa after dark. There was a 31% moon but we still had to use spotlights to search for the rocks. The howling winds brought the temperature below freezing. It took us awhile to find these rocks, we had just about given up and were making our way back to our vehicle when we came upon these 2, and a couple more, lit perfectly by the remaining moonlight.