License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Anonymous, French, 16th century. S. Costanza, drum, interior, elevation; column shafts, profiles; narthex, section; stair, detail plan (recto) stair, plans; window, elevation (verso), early to mid-16th century. The Metropolitan Museum of Art.