There is also a Shi'a minority. The Jerusalem Center for Public Affairs estimates the Shia population at 1 to 2.2 million and could measure as much as 3 million. The Ahmadiyya population is estimated at less than 50,000, whereas the Salafi (ultra-conservative Sunni) population is estimated at five to six million. Cairo is famous for its numerous mosque minarets and has been dubbed "The City of 1,000 Minarets".