Entrance to Cave of the Winds [Niagara Falls, N.Y.] by George E Curtis https://www.rawpixel.com/image/14288728/entrance-cave-the-winds-niagara-falls-ny-george-curtisFree Image from public domain licenseDiagram showing balls representing different stages of consciousness https://www.rawpixel.com/image/13990829/diagram-showing-balls-representing-different-stages-consciousnessFree Image from public domain licenseLabrador. Square Island. Fish Stages and Harbor. by H N Robinson https://www.rawpixel.com/image/14296827/labrador-square-island-fish-stages-and-harbor-robinsonFree Image from public domain licenseThe Dancing Lesson, Part 2: The Minuet by George Cruikshank https://www.rawpixel.com/image/8988203/the-dancing-lesson-part-the-minuet-george-cruikshankFree Image from public domain licenseWilliam Cullen. Stipple engraving by W. Howison, 1847, after W. Cochrane. https://www.rawpixel.com/image/14013542/william-cullen-stipple-engraving-howison-1847-after-cochraneFree Image from public domain licenseSaint Andrew. Line engraving by A. Petrak after M. Schongauer. https://www.rawpixel.com/image/13973573/saint-andrew-line-engraving-petrak-after-schongauerFree Image from public domain licenseFluitspelende figuur en twee dansende vrouwen (1800 - 1900) by anonymous https://www.rawpixel.com/image/13795936/fluitspelende-figuur-twee-dansende-vrouwen-1800-1900-anonymousFree Image from public domain licenseFremont's Peak, Wind River Mountains, Wyoming by William Henry Jackson https://www.rawpixel.com/image/14283411/fremonts-peak-wind-river-mountains-wyoming-william-henry-jacksonFree Image from public domain licenseJohann Friedrich, Graf von Struensee. Etching by W. Nicholls. https://www.rawpixel.com/image/14019516/johann-friedrich-graf-von-struensee-etching-nichollsFree Image from public domain licensePennsylvania's Exhibit of Birds, World's Columbian Exposition. by Benjamin West Kilburn https://www.rawpixel.com/image/14294788/photo-image-person-art-animalFree Image from public domain licenseAn anthropomorphical figure consisting of a bird's body and a human head is sitting on a branch of a tree next to a dangling… https://www.rawpixel.com/image/13979932/image-cartoon-face-personFree Image from public domain licenseCongress Hall, Piazza, Saratoga Springs, [N.Y.] by Deloss Barnum https://www.rawpixel.com/image/14287248/congress-hall-piazza-saratoga-springs-ny-deloss-barnumFree Image from public domain licenseEngine House in which John Brown was captured, Har. Ferry, Va. by John P Soule https://www.rawpixel.com/image/14300540/engine-house-which-john-brown-was-captured-har-ferry-va-john-souleFree Image from public domain licenseThe components of a camera obscura. Engraving by Defehrt after L.J. Goussier. https://www.rawpixel.com/image/14013708/the-components-camera-obscura-engraving-defehrt-after-lj-goussierFree Image from public domain licenseThe Cliff House and Environs, San Francisco. [second view] by Carleton Watkins https://www.rawpixel.com/image/14310443/the-cliff-house-and-environs-san-francisco-second-view-carleton-watkinsFree Image from public domain licenseOread Collegiate Institute, Worcester, Mass. by Henry P Moore https://www.rawpixel.com/image/14293781/oread-collegiate-institute-worcester-mass-henry-mooreFree Image from public domain licenseMuscles and bones of the vertebral column. Engraving by C. Grignion after B.S. Albinus, 1748. https://www.rawpixel.com/image/14000533/image-paper-art-patternFree Image from public domain licenseWiley (Old Fellows) Monument, Broadway &c. [Baltimore, Maryland] by William M Chase https://www.rawpixel.com/image/14290619/photo-image-art-public-domain-paintingFree Image from public domain licenseElfin Gorge head of Glen Arcadia - looking down. by George F Gates https://www.rawpixel.com/image/14293310/elfin-gorge-head-glen-arcadia-looking-down-george-gatesFree Image from public domain licenseCascade du pisse vache, canton du Valais, Suisse]/[Waterfall of The Pissing Cow https://www.rawpixel.com/image/14304854/cascade-pisse-vache-canton-valais-suissewaterfall-the-pissing-cowFree Image from public domain licenseC19 Chinese ink drawing: Boil diagonally opposite the mouth https://www.rawpixel.com/image/13976098/c19-chinese-ink-drawing-boil-diagonally-opposite-the-mouthFree Image from public domain licenseA man selling steamed dumplings . Watercolour by a Chinese artist, ca. 1800. https://www.rawpixel.com/image/13953657/man-selling-steamed-dumplings-watercolour-chinese-artist-ca-1800Free Image from public domain licenseJapanese basket makers. Japan. [Fujiyama, The Sacred Mountain.] by Carleton H Graves https://www.rawpixel.com/image/14293810/photo-image-face-person-artFree Image from public domain licensePine Cooley, two miles below Prescott, Wis. by John P Doremus https://www.rawpixel.com/image/14289582/pine-cooley-two-miles-below-prescott-wis-john-doremusFree Image from public domain licenseThe South Dome from the little Yo-Semite Valley, Mariposa County. by Lawrence and Houseworth https://www.rawpixel.com/image/14295074/photo-image-plant-tree-artFree Image from public domain licenseMount Starr King, from Glacier Point, Yosemite Valley, Mariposa County, Cal. by Carleton Watkins https://www.rawpixel.com/image/14301153/image-plant-tree-artFree Image from public domain licenseView of Edmondson's Victoria Hotel by George Washington Wilson https://www.rawpixel.com/image/14302047/view-edmondsons-victoria-hotel-george-washington-wilsonFree Image from public domain licenseGerman Church, Ruins of the Chicago Fire, 1871 by John Bullock https://www.rawpixel.com/image/14287450/german-church-ruins-the-chicago-fire-1871-john-bullockFree Image from public domain licenseA soldier in uniform is having his boots cleaned in the street by a man kneeling in a box. Coloured aquatint with etching. https://www.rawpixel.com/image/13956962/image-cartoon-person-artFree Image from public domain licenseMining quarry with special equipment.. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3289596/free-photo-image-art-aerial-view-archaeologyFree Image from public domain licenseOzark National Forest, Russellville, United States. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3297086/free-photo-image-abies-architecture-artFree Image from public domain licenseMiliary tubercles in the sub-serous tissue investing the heart https://www.rawpixel.com/image/13966467/miliary-tubercles-the-sub-serous-tissue-investing-the-heartFree Image from public domain licenseEbbing and Flowing Well. [Craven, England] by Michael Horner https://www.rawpixel.com/image/14292723/ebbing-and-flowing-well-craven-england-michael-hornerFree Image from public domain licenseOpera omnia anatomico-medico-chirurgica, hucusque edita / [Frederik Ruysch]. https://www.rawpixel.com/image/13980231/opera-omnia-anatomico-medico-chirurgica-hucusque-edita-frederik-ruyschFree Image from public domain licenseMaterials and utensils for painting in miniature. Engraving by R. Bénard after Bourgeois. https://www.rawpixel.com/image/14016574/image-paper-art-public-domainFree Image from public domain licenseRuit met een gele bloemenvaas, gedragen door een satyr (1550 - 1575) by anonymous https://www.rawpixel.com/image/13751693/image-cartoon-trophy-personFree Image from public domain licenseThigh of a patient with an intermuscular synovial cyst of the knee https://www.rawpixel.com/image/14015954/thigh-patient-with-intermuscular-synovial-cyst-the-kneeFree Image from public domain license