License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Hieronymus Cock. View of ruins on the Palatine Hill with trabeated facade at left and arcades at center, from "The Ruins of Rome" (Praecipua aliquot Romanae antiquitatis ruinarum monimenta, vivis prospectibus), 1550. The Metropolitan Museum of Art.