The Round Tower, from "Carceri d'invenzione" (Imaginary Prisons)ca. 1749–50Free · sharp to 9.6 × 12.5 in at 300 dpi, uncropped
A sedan chair, a coach, a commode, a side table and two clocks (Deux ch. à porteurs v. de côté, une commode, une console, deux pedules, un meuble indét), from Diverse Maniere d'adornare i cammini ed ogni altra parte degli edifizi...(Different Ways of ornamenting chimneypieces and all other parts of houses)ca. 1769Free · sharp to 8.2 × 12.2 in at 300 dpi, uncropped
Bird in shell at the center of the lintel, with a frieze of trophies, surmounted by an overmantel with candelabra and flanked by chairs. (Ch. décorée d'une frise de casques et d'armures . . .)1769 (?)Free · sharp to 12.2 × 7.9 in at 300 dpi, uncropped
Coat of Arms of Clement XIII (Rezzonico)1758–69Free · sharp to 8.7 × 12.1 in at 300 dpi, uncropped
Frontispiece from "Prima Parte di Architetture, e Prospettive"ca. 1750Free · sharp to 8.7 × 12.1 in at 300 dpi, uncropped
Interior view of St. Peter's Basilica in the Vatican, from "Vedute di Roma" (Roman Views)ca. 1748Free · sharp to 12.6 × 8.7 in at 300 dpi, uncropped
Parte di ampio magnifico Porto all'uso degli antichi Romani, ove si scuopre l'interno della gran Piazza pel Comercio... (Part of a spacious and magnificent Harbor for the use of the ancient Romans opening onto a large market square...), from "Opere Varie di Archiettura, prospettive, grotteschi, antichità; inventate, ed incise da Giambattista Piranesi Architetto Veneziano" (Various Works of Architecture, perspectives, grotesques, and antiquities; designed and etched by Giambattista Piranesi, Venetian Architect)ca. 1749–50Free · sharp to 12.4 × 9.2 in at 300 dpi, uncropped
St. Giovanni in Laterano, Interior, from "Vedute di Roma" (Views of Rome)ca. 1768Free · sharp to 13.3 × 8.6 in at 300 dpi, uncropped
The Drawbridge, from "Carceri d'invenzione" (Imaginary Prisons)ca. 1749–50Free · sharp to 9.5 × 12.5 in at 300 dpi, uncropped
The Octagonal Room in the Small Baths at the Villa of Hadrian (Tivoli)ca. 1777Free · sharp to 13.3 × 9.6 in at 300 dpi, uncropped
The Pantheon exterior (Veduta del Pantheon d'Agrippa oggi Chiesa di S. Maria ad Martyres)1720–78Free · sharp to 12.7 × 9.1 in at 300 dpi, uncropped
The Triumphal Arch, from "Grotteschi" (Grotesques)ca. 1748Free · sharp to 12.3 × 8.9 in at 300 dpi, uncropped
Two Men Holding Long Staffs (recto); Proof impression of part of an etching, and scribbles in the artist's hand (verso)1720–78Free · sharp to 11.8 × 9.1 in at 300 dpi, uncropped
View of the Mausoleum of the Emperor Hadrian (now called Castel S. Angelo) from the rear, from Vedute di Roma (Roman Views)ca. 1756Free · sharp to 12.6 × 9.9 in at 300 dpi, uncroppedReading the board
Each card shows the largest print the Met's file makes at 300 dpi without cropping — that's the sharpness you'd want for something you'll stand close to. The biggest file in this set isThe Octagonal Room in the Small Baths at the Villa of Hadrian (Tivoli), at 4,000 × 2,881 pixels: enough for a 13.3 × 9.6 in print at 300 dpi, or 26.7 × 19.2 in at poster sharpness.
The Met flags one of these as a collection highlight: The Round Tower, from "Carceri d'invenzione" (Imaginary Prisons).
Every page has a size chart against standard frames, the museum record, and the frame and light that make a print look like it cost more than it did. The file itself is free. It always was.