brandenburg gate in potsdam

039 arch architectural architecture art beginning below blue border brandenburg brandenburger building carl christian city clouds columns constantine corinthian daylight double excise facade figures frederick freestanding gate georg germany gontard historical history limits luisenplatz old ornamentation ornaments passage pedestrian perspective pilaster plaster potsdam protection restoration sandstone securing sign sky straae strips stucco style summer town trophies unger von wall yellow