License, verbatimPD
The National Gallery of Art: open access image with no usage restrictions under the NGA's open access policy (openaccess=1 in the Gallery's published_images dataset).
Laura Piranesi after Giovanni Battista Piranesi. Veduta del Tempio di Antonino, oggi Dogana di Terra (View of the Temple of Antoninus, now the Land Customs Office), c. 1780s. National Gallery of Art, Washington.