Fez, Morocco's famous historical and cultural city and the third largest city, is the oldest among the four ancient imperial cities, and indisputably the symbol of Morocco's center. The city took its shape soon after the Arab swept off the North Africa and Spain, and became the country's religious and cultural center. The Arab region located in the old Fez is one of the world's largest medieval cities, the winding alleys in the city are crowded with all kinds of manual workshops, restaurants and markets. Mosques, schools, dye-works and tanneries are scattered in the city. As the oldest emperor city in Morocco, Fez has established sister-city relations with 12 ancient cities including Lahore (Pakistan), Fiorentina (Italy), Crowdopa (Spain), Strasbourg (France) and Wuxi (China).