- Mons is a city located in the Belgian province of Hainaut. It is the capital and largest city of the province and has a population of around 94,000 people. Mons is known for its historical significance and architectural beauty, with landmarks such as the Gothic-style Mons Belfry and St. Waudru's Collegiate Church. The city is also home to several museums, including the Mons Memorial Museum, which commemorates World War I, and the Museum of Fine Arts. Additionally, Mons is famous for its annual festival called Doudou, a UNESCO recognized event that involves a procession, a dragon, and a reenactment of Saint George slaying the dragon.