Recent
images from the Mars Reconnaissance Orbiter. Above, dunes.
Erosion gullies.
A recent impact crater.
Polygonal ridges in the Gordii Dorsum, region, possibly dunes that solidified in some way.
Sand dunes and ripples in Proctor Crater.
And a detailed image one of the mysterious holes in the planet:
This enhanced image shows the inside of a rimless pit about 310 meters (1,017 feet) in diameter, northwest of the mountain Ascraeus Mons in the northern hemisphere of Mars. The pit has a very steep eastern wall (on the right) and more gently sloped western wall. Shadows and overhangs obscure some of the interior, but this stretched-brightness image shows boulders on the floor.
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