Take a look at this Civil War map of D.C. and its surroundings. Click on it for greater detail and you'll be able to see all the fortifications around the city, including Fort Totten and Fort Lincoln.

An authentic look at a real estate advertisement from 1890s Washington, DC. Tour Fort Lincoln Heights, just two miles from the city boundary, where seven-room homes sold for $2,000 (around $51,000 today)!