The 500-year-old tradition of ‘Heiligdomsvaart’ (Pilgrimage of the relics) is held in Susteren once every seven years. For fourteen days, Susteren becomes the place at which culture, history, and religion converge. During the Heiligdomsvaart, the village welcomes many tens of thousands of visitors who come to watch the open-air play (ten performances) and the ‘Reliekenstoet’ (relics procession).