Currently closed for restoration that's scheduled to finish in spring 2020, this Quranic learning centre was once the largest in North Africa and remains among the most splendid. ‘You who enter my door, may your highest hopes be exceeded’ reads the inscription over the entryway, and after almost six centuries, the blessing still works its charms on visitors. It was founded in the 14th century under the Merinids, but fully kitted out with its exuberantly ornate decoration in 1565 in the Saadian era.