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. Another view of the remains of the Pronaos of the Temple of Concord (The Temple of Saturn with Arch of Septimius Severus in left background), from "Vedute di Roma" (Views of Rome), part I, ca. 1750–78. The Metropolitan Museum of Art.