The town's main church and the symbolic heart of Geel's centuries-old practice of fostering mentally ill people in family homes. Late-Gothic, mostly fifteenth century with earlier elements, with a finely carved Antwerp retable in the choir depicting the life of Saint Dymphna. The Sick-Room (Ziekenkamer) behind the church, where pilgrims spent the nights of their nine-day cure, still survives.
Free to enter. The most atmospheric time is the Dymphna procession in May; the rest of the year the church is mostly quiet, and the wooden Antwerp altarpiece deserves slow looking.