Memoirs of Margaret Fuller Ossoli
p278“With him she examined, leaf by leaf, the designs of Raphael, of Michel Angelo, of Da Vinci, of Guercino, the architecture of the Greeks, the books of Palladio, the Ruins, and Prisons of Piranesi”
Emerson, Ralph Waldo, William Henry Channing, and James Freeman Clarke, eds. Memoirs of Margaret Fuller Ossoli. 2 vols. Boston: Phillips, Sampson and Company, 1852.
Inferred Margaret Fuller engaged with Giovanni Battista Piranesi's striking architectural etchings, specifically referencing his series of imaginary prisons, the Carceri d'invenzione, and his studies of Roman antiquity, Le Antichità Romane or Vedute di Roma.