This view from the navigation camera near the top of the mast on NASA's Mars Exploration Rover Spirit shows the tracks left by the rover as it drove southward and backward, dragging its inoperable right-front wheel, to the location where the rover broke through a crust in April 2009 and became embedded in soft sand. Spirit took this image (NASA Media Archives). Buy this as a superb wall poster, a canvas print or a framed print.