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Google MarsGoogle Maps has collaborated with NASA researchers at Arizona State University to present brightly colored, detailed maps of the Red Planet.
The opening screen shows a wide range of features: volcanoes, rivers, plains--pretty much what an Earth geographical map looks like.
The easiest way to use the map is to click on a category on top and then click on the matches. Under "Spacecraft" you can find the landing site of the Mars Rover Spirit.