Annenberg Foundation
Annenberg Learner: United States History Map: From Sea to Shining Sea
A great interactive map that reinforces your knowledge of the geographic features of the United States. Begin by reading general information on reading maps, then play the game.
Other
Boat Safe Kids
This is a delightful site about boats and boating. Lots of games plus a terrific overview of the history of navigation. Includes a visit to a reproduction of Columbus' Nina.