Google has posted an interactive topographic map of Mars that you can use to explore the planet's surface. With it you can zoom and pan the Martian surface to view craters, volcanoes, mountains, plains and canyons. The map also has over 100 features marked with pushpins. Clicking on a pushpin gives you more detailed information to help you learn about the Red Planet.
Image by USGS
Take a trip to observe the Topography of Mars