BL5348466: Notes and drawings by Leonardo da Vinci, early 16th century. Pages from the Notebook of Leonardo da Vinci (1452-1519), showing sketches and diagrams. / Bridgeman Images

ELS9190736: La belle Ferroniere …, Vinci, Leonardo da (1452-1519) / Bridgeman Images

LLM3657356: Male Mona Lisa postcard sent in the US, 1909 (litho) (see also 3657355), American School, (20th century) / Bridgeman Images

DGA3938550: Water-drawing device, woodcut from De re military, by Roberto Valturio, printed by Christian Wechel, Paris, 1532 / Bridgeman Images

DGA3938181: Perspectives and sections of Gaillard-Haillot boiler, engraving from Nouvelles annales de la construction, 1868 / Bridgeman Images

DGA3939438: Design for columns for Vatican colonnade, engraving from Templum Vaticanum, by Carlo Fontana, 1694 / Bridgeman Images

DGA3939940: Oven for metalworking, engraving from De Re Metallica (On Nature of Metals), by Georg Agricola, published in Basel in 1561 / Bridgeman Images

DGA3939943: Copper processing oven, engraving from De Re Metallica (On Nature of Metals), by Georg Agricola, published in Basel in 1561 / Bridgeman Images

DGA3939629: Building stages of falx muralis, siege hook, woodcut from De re militari libri quatuor (Epitoma rei militaris), by Publius Flavius Vegetius Renatus, printed by Christian Wechel, Paris, 1535 / Bridgeman Images

DGA3954035: Fort of Sao Joao da Foz, at mouth of Douro River, Porto, Portugal, illustration from Teatro universale, Raccolta enciclopedica e scenografica, No 353, April 10, 1841 / Bridgeman Images

DGA3938190: Special iron columns, United States of America, engraving from Nouvelles annales de la construction, 1870 / Bridgeman Images

DGA3938943: Shape of protective covers (H), shape of ditch shelter (I), and frames for protective covers (K, L), copperplate engraving from Diffesa et offesa delle piazze, by Pietro Paolo Floriani, published by Giuliano Carboni, Macerata, 1630 / Bridgeman Images

DGA3938581: Quick-firing rotating bombard platform, siege engine, woodcut from De re military, by Roberto Valturio, printed by Christian Wechel, Paris, 1532 / Bridgeman Images

DGA3939624: Underwater warrior, woodcut from De re militari libri quatuor (Epitoma rei militaris), by Publius Flavius Vegetius Renatus, printed by Christian Wechel, Paris, 1535 / Bridgeman Images

DGA3939614: Siege tower, woodcut from De re militari libri quatuor (Epitoma rei militaris), by Publius Flavius Vegetius Renatus, printed by Christian Wechel, Paris, 1535 / Bridgeman Images

DGA3939939: Oven for metalworking, engraving from De Re Metallica (On Nature of Metals), by Georg Agricola, published in Basel in 1561 / Bridgeman Images

IBE5332961: Frontispiece 'Life of Leonardo da Vinci', 17th century (engraving) / Bridgeman Images

ANJ7219590: Contemporary architecture : School Leonardo da Vinci, Terni, Italy, Ridolfi, Mario (1904-84) & Frankl, Wolfgang (1907-94) / Bridgeman Images

TRK879406: Study of Leonardo da Vinci. Mechanical loom. 15th century. / Bridgeman Images

TRK879408: Study of Leonardo da Vinci. Mechanical loom. 15th century. / Bridgeman Images

TRK879410: Study of Leonardo da Vinci. Mechanical loom. 15th century. / Bridgeman Images

TRK879416: Study of Leonardo da Vinci. Multiple cylinder mill. Model. / Bridgeman Images

TRK879417: Study of Leonardo da Vinci. Multiple cylinder mill. Model. / Bridgeman Images

CUB4523469: Medieval towers, Da Vinci square, Pavia, Lombardy, Italy / Bridgeman Images

GIA4747527: Leonardo da Vinci (Leonardo da Vinci) painting the Mona Lisa (Mona Lisa). Illustration by Walter Molino for ""la Domenica del Corriere"".1952, Molino, Walter (1915-1997) / Bridgeman Images

DGA548579: Grotesque heads, 1730, by Anne-Claude-Philippe (aka Count de Caylus, 1692-1765), from works by Leonardo Da Vinci, engraving. / Bridgeman Images

DGA3932227: Terracotta vase with two handles, Etruscan civilization / Bridgeman Images

DGA3938549: Water-drawing device, woodcut from De re military, by Roberto Valturio, printed by Christian Wechel, Paris, 1532 / Bridgeman Images

DGA3939927: Producing silver discs immediately after fusion, engraving from De Re Metallica (On Nature of Metals), by Georg Agricola, published in Basel in 1561 / Bridgeman Images

DGA3938564: Siege ladder and climbing shoes, woodcut from De re military, by Roberto Valturio, printed by Christian Wechel, Paris, 1532 / Bridgeman Images

DGA3938565: Rope and wooden siege ladders, woodcut from De re military, by Roberto Valturio, printed by Christian Wechel, Paris, 1532 / Bridgeman Images

DGA3939635: Woodcut from De re militari libri quatuor (Epitoma rei militaris), by Publius Flavius Vegetius Renatus, printed by Christian Wechel, Paris, 1535 / Bridgeman Images

DGA3939368: Embossed silver medallion with Medusa's head / Bridgeman Images

DGA3939617: Siege engine, woodcut from De re militari libri quatuor (Epitoma rei militaris), by Publius Flavius Vegetius Renatus, printed by Christian Wechel, Paris, 1535 / Bridgeman Images

LPH8678902: Leonardo 32 (drawing), Steadman, Ralph (b.1936) / Bridgeman Images

LPH8678697: I Leonardo 29 (drawing), Steadman, Ralph (b.1936) / Bridgeman Images