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The Round Tower, plate 3 from the second edition of Carceri d'invenzione (Imaginary Prisons)
From the collection of Art Institute of Chicago. Free to download, adapt and use — no permission needed.
Credit lineThe Round Tower, plate 3 from the second edition of Carceri d'invenzione (Imaginary Prisons). 1750, reworked 1761. Giovanni Battista Piranesi, Italian, 1720-1778. The Art Institute of Chicago, Joseph Brooks Fair Memorial Collection. CC0.