Maps can include a variety of information, such as floodplains, earthquake zones, and demographics.
A great source of graphic representations of detailed data. The world is changing, and it would be difficult to find better visual proof than this magnificent march of maps laying out the major categories of cartographic materials held by the Earth Sciences and Map Library's collections at the University of California, Berkeley. Click on thumbnails in for each kind of map to see enlargements in their full traditional and digital beauty. Notice that the best of the rich craft and art of cartography is not lost, but is enhanced. There are maps at this wonderful site from all eras and areas of the United States.