Today's Image of Mars is an amazing shot from Mars Express of Ceraunius Tholus (left) and Uranius Tholus (right). Ceraunius Tholus is 130km in diameter and 5.5km high, while Uranius Tholus has a diameter of 62km and a height of 4.5km.
Both Ceraunius and Uranius Tholus are located in the Tharsis Quadrangle of Mars, which was once a hotbed for volcanic activity on Mars. Clicking on this image will take you to the high resolution version. [See another image of Ceraunius Tholus and Uranius Tholus showcased by Mars Travel]