National Air Museum Building in South Yard, by Unknown, 1920's, Smithsonian Archives - History Div, The National Air Museum building in the South Yard seen from the southeast side with a French made Renault tank and a German howitzer sitting by its door. On the street many automobiles from the 1920's are parked and in the foreground is wrought iron fences around yards. The Air Museum building was a temporary metal building from World War I military work. The Smithsonian Institution Building is seen in the background..