As all old Moroccan cities have high and impregnable walls, the gates (or babs) have special significance. Idriss set out to build the grandest yet seen. Built with marble columns and detailing stolen from the ancient Roman city of Volubilis, the outside of Bab El Mansour is quite a sight. The opposite side is a completely different matter; we walked on by it, thinking it was just a utility entrance. Those entering the bab were made to negotiate a dogleg entrance, especially designed to slow attacking armies if the bab ever were breached.