License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Aegidius Sadeler II. View of the Baths of Caracalla, indicating with inscribed letter 'A' the places from which columns were reportedly taken by Pope Pius IV to be sent to the Grand Duke of Florence, plate 19 from "Ruins of the antiquity of Rome, Tivoli, Pozzuoli, and other places" (Vestigi della antichità di Roma, Tivoli, Pozzvolo et altri luochi), 1606. The Metropolitan Museum of Art.