File:Photograph of the National Archives Building Constitution Avenue Entrance Portico and Pediment , 12-22-1935 (14059482089).jpg - Wikimedia Commons
Photograph of the Pennsylvania Avenue Pediment and Portico of the National Archives Building, Washington, D.C. - NARA & DVIDS Public Domain Archive Public Domain Search
Archive – Portico Designs
The portico entrance to Romano's Restaurant at 399-400 Strand (BL21217) Archive Item - The Bedford Lemere Collection | Historic England
Portico, a Repository of Science and Literature 1816-1818 : Free Texts : Free Download, Borrow and Streaming : Internet Archive