Al Quaraouiyine Mosque
Al Quaraouiyine, built in 859 by Fatima al-Fihri, is believed to be one of the oldest universities in the world. It now operates as a mosque and cannot be entered by non-Muslims. However, its library, renovated in 2016, is open to the public, and you can get a glimpse of the impressive, handmade tilework dating back to the 9th century. You can also get a perfect view of the mosque courtyard from the rooftops of nearby restaurants in the medina.
This is the most iconic place in Fez, and the oldest tannery in the world, where they still operate as they did in medieval times. Here, men make leather in a massive tannery surrounded by houses and shops. The smell of the dyeing process can get rather intense, so take a scarf to cover your nose (or they will give you mint leaves to rub under it). This is a great place to buy your leather souvenirs. Fés or Fez (Fas in Arabic) is the third largest city in Morocco, after Casablanca and Rabat, with a population of 946,815 (2004 census).