Maps showing political status of Europe and Mediterranean basin at the end of each century from AD 1 to AD 2000, plus maps of historical battle sites. Site in English and French.
http://www.roadmaps.org/
RMCA is a group of road map collectors throughout North America and Great Britain.
http://www.stub.unibe.ch/stub/ryhiner/
16th to 18th c. maps of Germany, Switzerland, and France from the University and Canton archives from the University of Bern in Switzerland.
http://www.livgenmi.com/1895/
Large images grouped by state from an 1895 US Atlas.
http://memory.loc.gov/ammem/gmdhtml/
Top-level categories include cities and towns, cultural, landscapes, conservation and environment, military battles and campaigns, discovery and exploration, transportation and communication. Searchable by keyword, location, creator, subject, and title.
http://lcweb2.loc.gov/ammem/gmdhtml/gmdhome.html
Searchable collection of digitized maps in the public domain from North America, 1544-1996. Grouped into categories: cities, environment, exploration, immigration, military, and transportation.