 Besides being famous for having the oldest existing, continually operating university in the world, the University of Al-Karaouine, Fes el Bali, with a total population of 156,000, is also believed to be the biggest car-free urban area in the world.UNESCO listed Fes el Bali, along with Fes Jdid, as a World Heritage Site in 1981 under the name Medina of Fez.The World Heritage Site includes Fes el Bali's urban fabric and walls as well as a buffer zone outside of the walls that is intended to preserve the visual integrity of the location.