Constantinople, Mosques of Sulieman and Golden Horn by Francis Frith https://www.rawpixel.com/image/14319856/constantinople-mosques-sulieman-and-golden-horn-francis-frithFree Image from public domain licenseThe Hippodrome, Istanbul, Turkey: the bronze Serpentine Column with the Blue Mosque in the background. Photograph by… https://www.rawpixel.com/image/13978106/photo-image-background-plant-treeFree Image from public domain licenseConstantinople - View from the Seraskier Tower, Showing the Golden Horn by Francis Bedford https://www.rawpixel.com/image/14322545/image-golden-water-public-domainFree Image from public domain licenseAya Sophia, Istanbul, Turkey. Photograph by Guillaume Berggren, ca. 1880. https://www.rawpixel.com/image/14017794/aya-sophia-istanbul-turkey-photograph-guillaume-berggren-ca-1880Free Image from public domain licenseIstanbul: the column of Constantine and the street Yeniçeriler Caddesi. Engraving attributed to D. Pronti after W. Reveley. https://www.rawpixel.com/image/13973719/image-cloud-horse-personFree Image from public domain licenseDolmabahçe Palace, Istanbul: the gateway of the Sultan. Photograph by Guillaume Berggren, ca. 1880. https://www.rawpixel.com/image/14008802/photo-image-person-sky-public-domainFree Image from public domain licenseConstantinople: the superintendant of the buildings and gardens of the city. Engraving by G. Scotin the elder, 1714, after… https://www.rawpixel.com/image/14001997/image-cartoon-person-artFree Image from public domain license