DISTRICT OF COLUMBIA

City of Washington

• Washington. "The Octagon"; nearly octagonal house. 1799 New York Ave. N.W. Built in 1801 for Colonel John Tayloe III; designed by William Thornton; treaty ending War of 1812 was signed here; headquarters of the American Institute of Architects 1898-1949; now a museum. National Historic Landmark.
  
  Photograph.
  
  Photograph. Perhaps taken in about 1945.
  
  Photograph.
  
  Links to many photographs.
  
  Sources: R. Kline, and the Smithsonian HABS project.
  Updated: July, 2003.
• Washington. Octagon house. Built in 1865. Now gone. Located at 1830 Phelps Place N.W.
  Source: R. Kline.
  Entered: September, 2002.
• Washington. Octagon house. Built in 1856. Now gone. Located on Georgia Avenue.
  Source: R. Kline.
  Entered: September, 2002.