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Maps are important. There is a wide variety of maps and surveys available on the net for free.
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Good navigational maps for local areas. The street map feature can also be very useful to see what an area is like from the ground.
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You can explore the whole earth and its terrain with google earth, look out into galaxies or even look at land images from Mars.
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Microsoft's answer to google earth. A useful feature of this earth survey are the 3D views.
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Get accurate survey maps of anywhere in the UK for free. A must for almost every project.
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The National Geographic has an interesting collection of visual maps which graphically explore relationships between the land and human activity.
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