This Hospital is not only one of Europe's oldest social institutions but also one of the most significant monumental buildings from the Middle Ages. Though initially used to tend to the sick, it eventually served as an almshouse. Open to the sky, the wooden chambers in the central nave, a large hall, were not added until the early 19th century. These chambers were also called "Kabäuschen" (cubby-holes). It is still used as a retirement home today. However, the chambers and the church hall are used today for individual events and for the Craftmen's Christmas Market.