A jockey riding in a race, location unknown, May 26, 2015. View public domain image source here https://www.rawpixel.com/image/6112412/photo-image-public-domain-person-freeFree Image from public domain licenseTombeaux des Sultan Mahmoud II et Abd-ul-Aziz by Sébah and Joaillier https://www.rawpixel.com/image/14276203/tombeaux-des-sultan-mahmoud-abd-ul-aziz-sebah-and-joaillierFree Image from public domain licenseDoorway from side chamber, Hagia Sophia by Abdullah Frères https://www.rawpixel.com/image/14284797/doorway-from-side-chamber-hagia-sophia-abdullah-freresFree 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 licenseThe Hippodrome, Istanbul, Turkey: the obelisk of Theodosius (right) , the Serpent Column (centre), and the column of… https://www.rawpixel.com/image/13985376/photo-image-sky-public-domain-cityFree Image from public domain licenseMausoleum of the sultans Mahmud II and Abdulaziz, Istanbul; a man kneels in front of the two decorative tombs. Photograph by… https://www.rawpixel.com/image/13991889/photo-image-person-church-artFree 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, 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 license