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 unidentified ruins with trabeated facade at left, arcades at center, and arch at right, from "The Roman Ruins" (Praecipua aliquot Romanae antiquitatis ruinarum monimenta, vivis prospectibus), 1551. The Metropolitan Museum of Art.