Octagon House - View this location on map  Constructed 1799-1800, this octagonal Federal-style townhouse, built by the architect who designed the U.S. Capitol, was occupied temporarily in 1814-15 by President Madison after the burning of the White House. The Treaty of Ghent, ending the War of 1812, was signed here. 1799 New York Avenue, NW, Washington, District of Columbia Historical, Architectural |