The Sabil-Kuttab of Abdel Rahman Katkhuda is one of the iconic structures of Islamic Cairo, depicted in scores of paintings and lithographs. Building this fountain-school combo was an atonement for sins, as it provided two things commended by the Prophet: water for the thirsty and enlightenment for the ignorant. This one was built in 1744 by an emir notorious for his debauchery. There’s nice ceramic work inside.