The Citadel of Cairo from Below Gebel El-Mukattam by Francis Frith https://www.rawpixel.com/image/14321685/the-citadel-cairo-from-below-gebel-el-mukattam-francis-frithFree Image from public domain licenseThe Mosque of Amer, Old Cairo. The most ancient in Egypt. by Francis Frith https://www.rawpixel.com/image/14319962/the-mosque-amer-old-cairo-the-most-ancient-egypt-francis-frithFree Image from public domain licenseCairo, Tombs of the Mamelukes and the Citadel by Francis Frith https://www.rawpixel.com/image/14319324/cairo-tombs-the-mamelukes-and-the-citadel-francis-frithFree Image from public domain licenseCairo, from the Citadel. Valley of R. Nile, Pyramids, &c. by Francis Frith https://www.rawpixel.com/image/14321131/cairo-from-the-citadel-valley-nile-pyramids-andc-francis-frithFree Image from public domain license