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 a large structure, remains of the Tomb of the Metelli on the Appian Way about five miles from Porta S. Sebastiano, in the village of S. Maria Nuova..., tome 3, tavola 15 from "Le Antichità Romane" (Roman Antiquities), published 1756–57. The Metropolitan Museum of Art.