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 Arch of Septimius Severus, with the Church of S. Martina on the right (Arco di Settimio Severo), from "Vedute di Roma", ca. 1759. The Metropolitan Museum of Art.