<Ul> <Li> Brightwood Beach Cottage, Litchfield, Minnesota </Li> <Li> Octagon Hotel, Oyster Bay, New York </Li> </Ul> <Li> Brightwood Beach Cottage, Litchfield, Minnesota </Li> <Li> Octagon Hotel, Oyster Bay, New York </Li> <Ul> <Li> George H. Gallup House, Jefferson, Iowa </Li> <Li> House of the Seven Gables (Mayo, Florida) </Li> <Li> Octagon House (Columbus, Georgia) </Li> <Li> Richard Peacon House, Key West, Florida </Li> <Li> Albert S. Potter Octagon House, Richmond, Rhode Island </Li> <Li> Poplar Forest, Bedford, Virginia </Li> </Ul>

What famous government building in the usa is in the shape of a polygon