The Racetrack Playa in Death Valley is one of most interesting places I’ve ever seen. These rocks have moved over thousands of years and how they do it is a mystery. Some speculate that when it rains, which is not very often, the clay gets slippery and strong winds move the rocks which weigh up to a couple hundred pounds. To get there is an adventure as well. Thirty miles on a single lane “road” of volcanic rock.