Altapedia - both political and physical maps of the world. Also background and facts about countries.
World Political and Physical Maps - maps and satellite images of all the countries.
Map Resources on the World Wide Web - links to many sites that have atlases and information about maps.
Historical Maps - a collection of web historical maps with a wide variety of approaches.
CIA World Fact Book - Countries described in terms of geography, language, climate, economy, etc.
The Columbia Gazetteer of North America - With 50,000 entries, the Gazetteer covers every incorporated place and county in the United States, along with several thousand unincorporated places, special-purpose sites, and physical features, as well as Canada, Mexico and the Caribbean. ?
Earthquakes - Latest earthquake information from the U.S. Geological Survey Earthquake Hazards Program
Geostationary Satellite Server - real-time satellite images provide a view from above.
National Geographic Map Machine - "Locate nearly any place on Earth, search and print historical, weather, and population maps, and more with our dynamic atlas."
National Atlas of the United States - You've seen other atlases. They're typically big books of paper maps. The pages in this atlas are here on the Internet whenever you need them. This is a new portrayal of America in maps. You've found the single best Federal source for national maps and geographic information on the Web.
Perry-Castaneda Library Map Collection - more than 230,000 maps covering the world.
Rare Map Collection - a collection of about 800 historical maps spanning nearly 500 years, from the sixteenth century through the early twentieth century.