Rover tracks disappear toward the horizon like the wake of a ship across the desolate sea of sand between the craters Endurance and Victoria on the Meridiani Plains. Opportunity took the image while stuck in the sand ripple dubbed Purgatory for over a month. This panorama (only partly shown here) was named Rub Al Khali after the “Empty Quarter” in the Arabian Desert. (Photo: NASA/JPL-Caltech/Cornell University)