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. Means by which the large blocks of travertine and marble were lifted during the construction of the large Tomb of Caecilia Metella, tome 3, tavola 53 from "Le Antichità Romane" (Roman Antiquities), published 1756–57. The Metropolitan Museum of Art.