The ancient city of Fes is listed as a World Heritage Site and is considered one of the world's largest urban pedestrian areas. The most "colorful" attractions in the ancient city are the leather dyeing workshops. The traditional process of using natural materials has been used for thousands of years to produce the world's top leather. Visitors must climb the roof of the surrounding houses to see how the workers in the dyeing workshop process leather before entering the visit, each person will send a piece of mint leaf to cover the sour smell of the dyeing workshop because they are not suitable for pinching the nose and leaving after a short visit. ~