Cairo, Egypt -- Bab Zuwayla gate. One of the three first gates installed around the historic walled city of Cairo, standing at the southern boundary of old Fatimid Cairo. The two minarets atop this tower actually belong to the nearby Mosque of al-Mu'ayyad, which sits just inside this gate (on the left). For a small fee, it is possible to climb the minarets for a spectacular view of old and new Cairo. © Rick Collier / RickCollier.com