The citadel of Saladin - and indeed, the Cairo skyline - is dominated by the Alabaster Mosque, or Mosque of Mohammed Ali. Modelled along classic Turkish lines, it took 18 years to build (1830 - 1848) although later the domes had to be rebuilt. It was commissioned by Mohammad Ali, ruler of Egypt from 1805 - 1849, who lies in the marble tomb on the right as you enter.
Perhaps the most evocative description of it is in Olivia Manning's The Levant Trilogy: "Above them Mohammed Ali's alabaster mosque, uniquely white in this sand-coloured city, sat with minarets pricked, like a fat, white, watchful cat." It has never found much favor with writers, who have criticized it for being unimaginative, lacking in grace and resembling a great toad. Note the chintzy clock in the central courtyard, a gift from King Louis-Philippe of France in thanks for the Pharaonic obelisk that adorns the Place de la Concorde in Paris. It was damaged on delivery and has yet to be repaired.