American Panorama: An Atlas of United States History

American Panorama is a FREE historical atlas of the United States for the twenty-first century. It combines cutting-edge research with innovative interactive mapping techniques, designed to appeal to anyone with an interest in American history or a love of maps. 

Common Sense Graphite's review of the website.

Apple Maps Fly-Over Cities

If you have access to an iDevice, check out Apple's Maps Flyovers! 

A list of cities and landmarks can be found here. 

1) Open Apple's Maps app.

2) Search for a listed city or landmark.

3) Click "Start Flyover" on the top.