Today's Image of Mars is of Udzha Crater, as taken by the Mars Odyssey Orbiter's THEMIS. Udzha Crater is 45km in diameter, but has been almost entirely covered by layers of ice and dust, so much so that only the highest part of the crater rim rise above the polar deposits and hint at its circular form.
Unfortunately there wasn't much information on Udzha Crater, so I created a Wikipedia page with the information I gathered. It is the first of many Wikipedia pages that Mars Travel will contribute to!
Clicking on this image will take you to the original high resolution image from THEMIS.