The Library of Congress: American Memory site has numerous historical documents, including old maps. Some military situation maps from the Second World War have been posted, most notably those from December 16, 1944 to January 18, 1945, the time period covering what is known as the Battle of the Bulge, These maps have been put together in a Flash presentation so that users can see the movements of the front line during that time.

By way of Plep.