License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Giovanni Battista Piranesi. The so-called Temple of Fortuna Virilis (now Church of S. Maria Egizziaca) (Veduta del Tempio della Fortuna Virile), ca. 1758. The Metropolitan Museum of Art.