Mons is a Belgian city located in the province of Hainaut. It is best known for its annual festival, the Ducasse de Mons (Doudou), which is recognized by UNESCO as a Masterpiece of the Oral and Intangible Heritage of Humanity. The city is rich in architectural treasures, including the Collegiate Church of Saint Waudru and the Belfry of Mons, both of which are also recognized by UNESCO.