Located near Bab Zuweila in Cairo, this is a mosque with an interesting story. The founder, a Mamluk sultan, was imprisoned and suffered greatly in this particular place; he vowed that if he ever came to power he would transform the prison into a school and mosque where intellectuals would come to study. After regaining his freedom, he did just that, turning the prison into one of the most beautiful and expensive mosques and madrasas to be built in Cairo. Marble in all its colours was brought from different locations and used to adorn the walls, ceiling, and floors in designs that will make you gape at their beauty. Twin minarets of the mosque rest above Bab Zuweila dominating the area. The mausoleums of the sultan and his family are found in the mosque.