Al-Karaouine Mosque and University, Morocco - stock photo

FEZ, MOROCCO - 1ST FEBRUARY 2018 - Streets and alleyways in the old Medina District of Fez connecting to the Al-Karaouine Mosque and University complex. Established at the very beginnings of Morocco's oldest imperial city, the University of Al-Karaouine (also written as Al-Quaraouiyine and Al-Qarawiyyin) was founded in 859 and is considered by Unesco and the Guinness Book of World Records to be the oldest continually operating university in the world. From ground level, the true shape and structure of the complex is hidden, where buildings are stacked so close together that roofs touch and crossover above the alleyways. But the trail of grand doorways and wooden walls help visitors define its outline.