HiRISE images of Mars

The image above is from the Marte Vallis region of Mars and nicely shows some mass wasting on the hillslopes.

The High Resolution Imaging Science Experiment (HiRISE) is a camera aboard the Mars Reconnaissance Orbiter. The project is part of the University of Arizona and the website is a great portal into high resolution of Mars' surface.

They have a lot of the images tagged by categories such as mass wasting, tectonic processes, fluvial processes, and others. See all the science themes here.