Keywords: Old Patent Office, model room - Washington, D.C..jpg en Model room located inside the Old Patent Office Building in Washington D C The building a National Historic Landmark located in the Penn Quarter neighborhood was designed by Robert Mills and now houses the Smithsonian's National Portrait Gallery and American Art Museum 5432 cwpbh 03283 Brady-Handy 1865 Washington D C in the 1860s Interior of the Patent Office Building Corridors in the United States PD-USGov Corridors in office buildings |