Koutoubia Mosque. The name is derived from the Arabic al-Koutoubiyyin for librarian, since it used to be surrounded by sellers of manuscripts. It is considered the ultimate structure of its kind. The tower is 69 m (221 ft) in height and has a lateral length of 12.8 m (41 ft). Six rooms (one above the other) constitute the interior; leading around them is a ramp by way of which the muezzin could ride up to the balcony. It is built in a traditional Almohad style and the tower is adorned with four copper globes.