A section of Ma'adim Vallis, one of the largest outflow channels on Mars, that runs from a region in the southern lowlands thought to have once contained numerous lakes north to Gusev crater. At about 700 km long, it significantly larger than Earth's Grand Canyon -- over 20 km wide and 2 km deep in some places.
An impact crater SW of Huygens Crater
Tyrrhenus Mons -- a large volcano in the Mare Tyrrhenum quadrangle of Mars,
Arsia Mons -- the southernmost of three volcanos (collectively known as Tharsis Montes) on the Tharsis bulge near the equator of the planet Mars. To its north is Pavonis Mons, and north of that is Ascraeus Mons. Volcanic deposits can be seen on the flanks. Mapped from an altitude of 6,653 miles (10,707 km) at a resolution 1,824 ft (556m) per pixel.
Valles Marineris -- a system of canyons that runs along the Martian surface east of the Tharsis region. At more than 4,000 km (2,500 mi) long, 200 km (120 mi) wide and up to 7 km (23,000 ft) deep, it is one of the largest rift canyons in the solar system. This image was taken at an altitude of of 15,000 miles (24,000 km) at a resolution of 0.7 miles (1.2 km) per pixel.
Eos Chaos -- a rough, collapsed section of Valles Marineris in the Coprates quadrangle on Mars. Fracturing patterns are clearly evident, which may help to understand the geologic processes that formed this canyon, the largest in the solar system.
Olympus Mons - the largest volcano in the solar system. 3 times higher than Mount Everest at a height of nearly 16 miles (22 km). It is the youngest of the large shield volcanoes in the Tharsis region.
Tharsis Tholus - an intermediate-sized shield volcano located in the eastern Tharsis region.
Phobos - one of the two moons of Mars, silhouetted against the Martian surface. Phobos orbits 6,000 km (3,700 mi) from the Martian surface, closer than any other known planetary moon. It is so close that it orbits Mars faster than Mars rotates, and completes an orbit in just 7 hours and 39 minutes.