The Bab el Kebir gate was built in 1150 by the Caliph Abdelmoumen and is one of the jewels of the Almohad architecture. 38.60 m long, 16 m wide and 13 m high, this door is made up of three rooms that follow each other in succession: the first (7.48 m x 7.12 m) is covered with a dome on horns; three steps lead to the second room (7.51 m x 7.53 m) equipped with a dome on pendants. The staircase leads to the terrace and the upper floor. In the 1980s, the gate was rehabilitated in an exhibition hall. In 2001, the Ministry of Culture undertook refurbishment work to provide this space with the necessary facilities for an exhibition gallery (hanging system, appropriate lighting, etc.). In April 2002, the gallery reopened its doors and has since been hosting national and international exhibitions