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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.
Google Mars says it chose a gray-scale to better highlight images over the planet's true color which looks like butterscotch.
The infrared map is taken from wavelengths that are invisible to the human eye. Higher resolution mosaics are highlighted within the image.
To find out about Martian geographical features, click on a category and then one of the search results. Clicking on the feature's name will bring up a NASA article which explains the feature in more detail.
This map shows where the "Face on Mars" was found and lets you read the story behind its legend.
From the farthest zoom back, you can see the map repeats three times.