I work at Sun Microsystems.
The opinions expressed here are my own,
and neither Sun nor any other party necessarily
agrees with them.
Pop on over to NASA’s Mars Reconnaissance Orbiter site and grab a copy of this 20048-by-9500 Martian Landscape (that link is to a page of alternatives, not the image itself, it’s safe to follow). Then drop it into your favorite photo-browsing application—the detail is remarkable—and go for a walk around Mars.