They usually have hundreds of jars of twisted root and twig neatly lined up along the walls.
Quartier des tanneurs / Chouara Tannery
In the midst of the maze-like medina are the colorful leather-dying pits. Any number of young boys will offer to guide you to them: just listen for "you want to see the tanneries?" The tour is free (though it is appropriate to offer 1-5 dirham to your "guide").
There is no chance of getting to see the tanneries by yourself, instead, be prepared for physical abuse for even trying! However, just 10 m left of the entrance is a leather shop that offers views to the tannery free of charge and you can see it all from the balcony. Expect to be pressured into buying goods from the shop in return.
It is possible to get into the tannery itself, hang around near the entrance until someone offers to take you in for 10 dirham. He will get you past the entrance and then you can wander in among the workers. A word of advice: wear closed shoes and maybe bring a mint leaf to sniff if you have a weak stomach.
The tanneries in the medina features leather-making techniques unchanged since the Middle Ages. Men walk the narrow paths between huge vats of lye and colorful dyes, water wheels creak as the leather is rinsed, and buildings facing the tannery are covered with pelts hanging to dry. Visit early in the morning before the sun hits the tannery and the stench sets in. Note that there is also Sidi Moussa Tannery in the medina, which is smaller and located about 700 m southeast of Chouara Tannery.
A breathtaking 14th-century religious college. The best example of Islamic architecture a non-Muslim can see in Fez, with wooden walls elaborately carved with geometric patterns and Arabic calligraphy, and a beautiful minaret. In the courtyard there is a portico with a still-functioning mosque, separated by the rest of the courtyard by a small moat.
Another former religious college open to visit, much smaller but just as richly decorated as the Bou Inania Madrasa. Built by the Marinid sultan Uthman II Abu Said in 1323-5.
Dates back to the inception of the city in the 9th century, with the completion of the foundation in 859-860. This makes it one of the oldest mosques in the world. The mosque had been renovated and expanded several times since then. Today, it is one of the relatively few remaining Idrisid-era establishments and the main landmarks of the city. Off-limits to non-Muslims.
One of the two fortresses overlooking the old city and contains an armaments museum. The view from the hills surrounding the old city is spectacular. The fort houses the Museum of Arms.
Southern fortress, a counterpart to the Borj Nord. The interior is not open, but like the Merenid Tombs it has spectacular views of the medina from the other side. It is a short walk (uphill) from Bab Ftouh.