Jongen met koe (1817 - 1886) by Frederik Lodewijk Huygens and Frederik Lodewijk Huygens https://www.rawpixel.com/image/13756795/image-paper-horse-cartoonFree Image from public domain licenseCharles Michel, Abbé de l'Epée. Line engraving by A.V. Sixdéniers. https://www.rawpixel.com/image/13985229/charles-michel-abbe-lepee-line-engraving-av-sixdeniersFree Image from public domain licenseGeneral Lying In Hospital, York Road, Lambeth: labour ward staff and students. Photograph, 1908. https://www.rawpixel.com/image/13986073/photo-image-face-people-hospitalFree Image from public domain licenseSir Isaac Newton. Coloured stipple engraving by R. Page, 1818, after Sir G. Kneller, 1702. https://www.rawpixel.com/image/14020126/image-face-person-artFree Image from public domain licensePresident Barack Obama, with First Lady Michelle Obama, delivers remarks during a reception for foreign heads of delegation… https://www.rawpixel.com/image/4049906/photo-image-face-person-microphoneFree Image from public domain licenseFalse Water Cobra (2011) by Smithsonian Institution. Original from Smithsonian's National Zoo. Digitally enhanced by… https://www.rawpixel.com/image/3060043/free-photo-image-brazilian-snake-amazingFree Image from public domain licenseTabulae sceleti et musculorum corporis humani / [Bernhard Siegfried Albinus]. https://www.rawpixel.com/image/13968594/tabulae-sceleti-musculorum-corporis-humani-bernhard-siegfried-albinusFree Image from public domain licenseSebastian Heinlin (Heinlein, Heinlinus). Line engraving by J. F. Fleischberger. https://www.rawpixel.com/image/13974440/sebastian-heinlin-heinlein-heinlinus-line-engraving-fleischbergerFree Image from public domain licenseThe phrenologist Bernard Hollander illustrating with his own head his system of cranial measurements. Photographs, c. 1902. https://www.rawpixel.com/image/13996112/photo-image-face-person-artFree Image from public domain licenseLeonardo da Vinci. Line engraving by R. Morghen after Leonardo da Vinci. https://www.rawpixel.com/image/14007381/leonardo-vinci-line-engraving-morghen-after-leonardo-vinciFree Image from public domain licenseThe Actor Regnier (L'Acteur Regnier) by Julien Vallou de Villeneuve https://www.rawpixel.com/image/14280678/the-actor-regnier-lacteur-regnier-julien-vallou-villeneuveFree Image from public domain licenseYoung African boy. Credit: Brant Stewart, RTI. Original public domain image from Flickr https://www.rawpixel.com/image/8759369/photo-image-public-domain-woman-kidFree Image from public domain licenseHead of a deity (c. 1425 - c. 1475) by anonymous and anonymous https://www.rawpixel.com/image/13732750/head-deity-c-1425-1475-anonymous-and-anonymousFree Image from public domain licenseJean Louis Alibert. Stipple engraving by Lambert le jeune. https://www.rawpixel.com/image/13991947/jean-louis-alibert-stipple-engraving-lambert-jeuneFree Image from public domain licenseAureolus Theophrastus Bombastus von Hohenheim [Paracelsus]. Stipple engraving by R. Cooper after R. Gaywood after Q. Matsys. https://www.rawpixel.com/image/13984058/image-face-person-artFree Image from public domain licenseFrau von Brustaniana, a character with a grotesque face. Line engraving attributed to D. Custos. https://www.rawpixel.com/image/14012093/image-cartoon-face-personFree Image from public domain licenseKarl, Freiherr von Rokitansky. Lithograph by A. Dauthage, 1853. https://www.rawpixel.com/image/14002900/karl-freiherr-von-rokitansky-lithograph-dauthage-1853Free Image from public domain licenseSaint John Nepomucen. Engraving by A. Rossi after P. Novelli. https://www.rawpixel.com/image/14002550/saint-john-nepomucen-engraving-rossi-after-novelliFree Image from public domain licenseEdward Caird, B.A., Professor of Moral Philosophy by Thomas Annan https://www.rawpixel.com/image/14317304/edward-caird-ba-professor-moral-philosophy-thomas-annanFree Image from public domain licensePortrait of J C de Brunett, Consul-General of Russia to Amsterdam (c. 1850) by anonymous https://www.rawpixel.com/image/13744837/image-face-person-artFree Image from public domain licenseThe people of China weighed down by the hierarchy of emperor, mandarins and priests. Coloured lithograph by Smith, 1858. https://www.rawpixel.com/image/13962103/image-cartoon-face-personFree Image from public domain licenseJacob worstelend met de engel (1617 - 1619) by Gerard ter Borch I https://www.rawpixel.com/image/13788311/jacob-worstelend-met-engel-1617-1619-gerard-ter-borchFree Image from public domain licenseWilliam Heberden. Mezzotint by J. Ward after Sir W. Beechey. https://www.rawpixel.com/image/14009544/william-heberden-mezzotint-ward-after-sir-beecheyFree Image from public domain licenseGray Seal (2013) by Abby Wood. Original from Smithsonian's National Zoo. Digitally enhanced by rawpixel. https://www.rawpixel.com/image/3060039/free-photo-image-zoo-animals-seal-abby-woodFree Image from public domain licenseDamaraland Mole-rat (2002) by Jessie Cohen. Original from Smithsonian's National Zoo. Digitally enhanced by rawpixel. https://www.rawpixel.com/image/3060633/free-photo-image-animal-public-domain-amazingFree Image from public domain licenseSimon Cameron by James Earle McClees and Julian Vannerson https://www.rawpixel.com/image/14316874/simon-cameron-james-earle-mcclees-and-julian-vannersonFree Image from public domain licenseLithograph portrait of Neville Bowles Chamberlain by Baugniet https://www.rawpixel.com/image/14260061/lithograph-portrait-neville-bowles-chamberlain-baugnietFree Image from public domain licenseWilliam Heberden. Stipple engraving by J. Thomson after Sir W. Beechey. https://www.rawpixel.com/image/14006887/william-heberden-stipple-engraving-thomson-after-sir-beecheyFree Image from public domain licenseBenares, India: a Hindu man wearing a robe. Photograph, ca. 1860. https://www.rawpixel.com/image/14021401/benares-india-hindu-man-wearing-robe-photograph-ca-1860Free Image from public domain licenseDe dwerg Cornelius Guttman als hoorndrager, ca. 1710 (1705 - 1715) by Martin Engelbrecht https://www.rawpixel.com/image/13745942/image-paper-cartoon-faceFree Image from public domain licenseA man, head and shoulders, wearing a red jacket. Gouache painting. https://www.rawpixel.com/image/13973119/man-head-and-shoulders-wearing-red-jacket-gouache-paintingFree Image from public domain licenseA man with a rolled sheet of paper in his hand is talking to another man in a gown and a hat who is sitting in a large… https://www.rawpixel.com/image/14011152/image-paper-cartoon-faceFree Image from public domain licenseLa Vierge et l'Enfant Jésus, par Murillo by Bayard and Reynard and Louis Désiré Blanquart Evrard https://www.rawpixel.com/image/14273253/image-face-jesus-personFree Image from public domain licenseSaint Joseph with the Christ Child. Etching by F. Bartolozzi after G.F. Barbieri, il Guercino. https://www.rawpixel.com/image/13990312/image-cartoon-face-jesus-christFree Image from public domain licenseWilliam Dobinson Halliburton. Photograph by Elliott & Fry. https://www.rawpixel.com/image/13997624/william-dobinson-halliburton-photograph-elliott-fryFree Image from public domain licenseMichael Faraday. Mezzotint by H. Cousins after T. Phillips, 1842. https://www.rawpixel.com/image/13995649/michael-faraday-mezzotint-cousins-after-phillips-1842Free Image from public domain licenseGerbrand Bakker. Line engraving by C. C. Fuchs after W. Lubbers. https://www.rawpixel.com/image/13993258/gerbrand-bakker-line-engraving-fuchs-after-lubbersFree Image from public domain licenseBrock Linker and Anna Peterson in seeding mix including mustard acting as a flea beetle trap crop around a canola field at… https://www.rawpixel.com/image/3336132/free-photo-image-farm-women-summer-farmer-field-flowersFree Image from public domain licenseAnna Hendriksdatter by Prince Roland Napoleon Bonaparte and G Roche https://www.rawpixel.com/image/14309147/anna-hendriksdatter-prince-roland-napoleon-bonaparte-and-rocheFree Image from public domain licenseSt Bartholomew's Hospital, London: a view of the courtyard. Coloured engraving. https://www.rawpixel.com/image/13970471/bartholomews-hospital-london-view-the-courtyard-coloured-engravingFree Image from public domain licenseKarl Asmund Rudolphi. Lithograph by A. Kunike after A. Temmel. https://www.rawpixel.com/image/14005913/karl-asmund-rudolphi-lithograph-kunike-after-temmelFree Image from public domain licenseLodovico Pasini. Lithograph by L. Fiorucci after C. E. Liverati, 1841. https://www.rawpixel.com/image/14021837/lodovico-pasini-lithograph-fiorucci-after-liverati-1841Free Image from public domain licenseJ. Warner. Stipple engraving by N. Branwhite, 1801, after S. Medley. https://www.rawpixel.com/image/14008629/warner-stipple-engraving-branwhite-1801-after-medleyFree Image from public domain license