There are many amazing images being transmitted by our robot emissaries at Mars and this is one of my favorites. Not only does it depict the half-mile Victoria Crater on that neighboring world but it shows us how weather reshapes the surface there. Winds have shifted the red sands to form dunes in the floor of the crater (at center) and drifts of sand and planes along the lines of wind direction (from right to left). At an even more detailed level this amazing photo also lets us look down on NASA's Mars Exploration Rover Opportunity and the tracks it made as it scooted along the rim of the crater from late 2006 to late 2007. For its beauty and its significance I've ordered a large print of this photo and will frame it for display on the wall of my office. (Note: This is a reduced-resolution image; Opportunity and its tracks won't be visible here. For a high-res image and the full story, visit this page at NASA.
PhotonStopper 
Awesome photo.