Bab Zewaila
Bab Zewaila is like Bab el Futh, to which it is closely related, consists of a great arched gateway 4.84 m wide defended by two oblong round fronted towers, solid for two third of their height and placed 9.17 m. Behind the archway is a passageway covered by a shallow dome on spherical triangle pendentives supporting the great platform which extends right across behind the upper rear face of both towers.
The whole structure measures 25.72 m in width, 25.36m from back to front and 20.10 m in height. We see once more the series of circles, the ends of columns let into the rubble core as a band-running around the towers and passage way at the seventh course from the ground level.
The towers have rounded fronts not semicircular in plan but formed of a segment of circle only.
The round front of the towers rested on a rectangular plinth of two courses the outer flanks of these towers are concealed on the west by the Mosque of al Mu'ayyad on the east by a row of houses.
The inner flanks of the towers are decorated with two similar shallow arched panels one within the other within them is much smaller panel composed of a pointed arch.
Distorted squares, each filled with a simple but crisply carved motif, sunflowers, pentagrams, hexagrams, stare, crosses, circles, grilles, decorates the splayed part, the whole being set in a simple border consisting of circle and a lozenge alternately set bock 1.49 m within this semicircular arch is the gate way border 4.85m in width and 6.48m in height, spanned by two horizontal arches.
Above the bracket and flush with its front edge, is a shallow arch of twenty one voussoirs, each with one bold joggle.

And above this in the parapet are five openings with lintels, the whole five being set in a frame which is quite plain except for its top edge.
The upper arch consists of nine voussoirs, the side ones of five. The upper arch, has a scalloped edge where as the side ones have net, but the voussoirs of the upper arch is decorated with a simple medallion a star of eight loops formed by eight nearly complete circles. It is similar to the medallions on Bab El Nasr shield, which, however are composed of six loops only.
In the panel below apex of this arch is a splendid medallion. In the upper part of each tower, above the great arched panel is a rectangular window opening from what was once the tower chamber it is covered by a flat joggled arch, above the great outer arch are five courses of masonry. It was here that herz found the remains of two lines of Kufic inscription under layers of plasters in 1897.
The text contains the shi'a confession of faith followed by several words from Quran.
The central part of the vault was cut through by sultan al Mu'ayyad when he decided to use the towers of Bab Zywayla as pedestals for two minarets of his mosque.