JupiterImages Corporation © 2005: x, insert pages 1 (top and bottom), 7 (bottom), 9 (top left and right, bottom left),
Archivio Montesanti: x, insert pages 3 (bottom left), 11 (bottom), 12 (bottom), 13 (top), 14 (bottom)
Trustees of the British Museum: x, insert pages 3 (bottom right), 8 (top left)
Alinari/Art Resource, NY, Uffizi, Florence, Italy: x insert page 6 (top left)
Alinari/Art Resource, NY, Statens Museum for Kunst, Copenhagen, Denmark: insert page 12 (top)
Scala/Art Resource, NY, Palazzo Vecchio, Florence, Italy: x, insert pages 4 (middle), 6 (middle and bottom)
Scala/Art Resource, NY: x, insert pages 2 (top), 13 (bottom)
Scala/Art Resource, NY, Galleria Borghese, Rome, Italy: insert page 14 (top)
Museo Nazionale di Capodimonte, Naples, Italy: x, insert page 7 (middle)
Douglas Steel: page 66
The New York Public Library, Astor, Lenox and Tilden Foundations Stuart Collection, Rare Books Division: insert page 8 (bottom) Michelangelo’s Basilica: “Incisione di Stefano du Perac” (source: Antoine Lafrery). Speculum Romanae manificentiae, Roma, 1681
The New York Public Library, Astor, Lenox and Tilden Foundations Miriam and Ira D. Wallach Division of Art, Prints and Photographs: insert pages 2 (bottom)
Rome in Ruins: etching Stefano du Perac. Parte del Monte Palatino, 1575, Print Collection, 4 (bottom left) Leonardo da Vinci sketch: centrally planned church, Art and Architecture Collection, 8 (middle) Basilica design of Antonio da Sangallo: engraving, 1548, Art and Architecture Collection, frontispiece and 16 (top and bottom), Giovanni Battista Piranesi: Veduta dell’ insigne Basilica Vaticana coll’ampio Portico e Piazza adjacente, 1775, Art and Architecture Collection
Bildarchiv Preussischer Kulturbesitz/Art Resource, NY: insert page 7 (top)
Vatican Museums, Vatican State: insert page 3 (top), 4 (top), 5 (top and bottom), 10 (top)
Biblioteca Apostolica Vaticana: x, xii, xiii, insert pages 4 (bottom right), 9 (bottom right), 10 (middle and bottom), 11 (top left and right) (middle left and right), 15 (all)