The Medina of Fes-al-Bali, Morocco (Pop.: 156,000)
The Medina of Fes-al-Bali is home to more than 156,000 people and is considered one of the largest contiguous car-free urban areas in the world. Its narrow street design is the result of its ancient heritage — with some sections only two feet wide. Not only are cars unable to traverse through the Medina, but riding a bike is also limited due to space.