Use these Internet resources to further explore the history of cartography.

The Perry-Castañeda Library Map Collection
The Perry-Castañeda Library Map Collection at the University of Texas at Austin holds more than 230,000 maps, many of which have been scanned and made available at this site. This extensive online collection includes hundreds of high quality, copyright-free maps of nations and cities, as well as many historical maps. A special "Electronic Maps of Current Interest" section highlights maps of places in the news. This site also hosts a variety of links to other map-related sites.
http://www.lib.utexas.edu/Libs/PCL/Map_collection/Map_collection.html

Working with Maps: What Do Maps Show?
The U.S. Geological survey offers an introduction to using maps for Grades 5-8. Rich with photographs, explanations, maps, activities, and a teacher's guide, this site is a great resource for learning about maps.
http://interactive2.er.usgs.gov/learningweb/teachers/mapsshow.htm