License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Antonio Tempesta. Plan of the City of Rome. Part 6 with the Aurelian city wall, the Porta Portuensis (Ostiensis?) and the Sepulcre of Caius Cestius., 1645. The Metropolitan Museum of Art.