The color image above is from NASA's Curiosity rover, and it shows part of the wall of Gale Crater -- it is part of a larger, high-resolution color mosaic made from images obtained by Curiosity's Mast Camera.
This image of the crater wall (higher resolution version here) is north of the location on Mars where the rover landed on Aug. 5, 2012 PDT/Aug. 6, 2012 EDT. Here, a network of valleys believed to have formed by water erosion enters Gale Crater from the outside. This is the first view scientists have had of a fluvial system -- one relating to a river or stream -- from the surface of Mars.
Curiosity is about 11 miles away from this area and the view is obscured somewhat by dust and haze, by the image provides new insights into the style of sediment transport within this system.
Photo courtesy of NASA/JPL-Caltech/MSSS