Fes el-Bali

Nine thousand alleys. That number stops being abstract the moment you step through Bab Bou Jeloud and the medina swallows you — a labyrinth of covered passages, sudden courtyards, and dead ends where the smell of cedarwood, tanned leather, and cumin hangs in layers. Donkeys loaded with hides brush past. A muezzin's call ricochets off medieval walls. Light falls in shafts through latticed screens, illuminating a tannery vat or a brass workshop or a fountain tiled eight centuries ago.

Fes el-Bali is the world's largest car-free urban zone and the oldest continuously inhabited medieval city in the world, founded in the 9th century. The Chouara tannery has operated since at least the 11th century, using the same lime-and-pigeon-dung process to produce leather. The University of al-Qarawiyyin, founded in 859 CE, is recognised by UNESCO and Guinness World Records as the oldest continuously operating degree-granting institution. The medina contains over 9,000 alleys, 180 mosques, and an estimated 10,000 workshops producing everything from zellige tilework to hand-beaten copper. GPS is largely useless here — navigation is by landmark, instinct, and the willingness to be lost.