Chefchaouen, or Chaouen, is a city in the Rif Mountains of northwest Morocco. It’s known for the striking, blue-washed buildings of its old town. Leather and weaving workshops line its steep cobbled lanes. In the shady main square of Place Outa el Hammam is the red-walled Kasbah, a 15th-century fortress and dungeon, and Chefchouen Ethnographic Museum. The octagonal minaret of the Great Mosque rises nearby.