Mons features remarkable religious architecture reflecting medieval spirituality and artistic achievement, with several churches open for both worship and cultural appreciation.
Construction began in 1450 and continued into the 17th century. Built to house relics of Saint Waudru, the patron saint of Mons, this church exemplifies Flamboyant Gothic architecture with soaring ribbed vaults, intricate stone tracery, and stained glass windows. The interior features ornate altars, sculptural details, and a peaceful contemplative atmosphere. The church hosts occasional concerts utilizing its exceptional acoustics and historic organ.