This photo shows an example of the mysterious moving rocks of Death Valley, California. These rocks and their trails have been observed for decades, but no one has actually seen one of the rocks in motion. Scientists do not have an explanation for the phenomena.
Jigsaw puzzle subject image credit: Special thanks to Eric Bryan for making the photograph used for this jigsaw puzzle available through the Creative Commons Attribution ShareALike license. Visit Eric Bryan's Flickr photostream.
See all jigsaw puzzles based on Eric Bryan's photographs.