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. View of the Flavian Amphitheater, called the Colosseum, from "Vedute di Roma" (Roman Views), part II, ca. 1750–78. The Metropolitan Museum of Art.