The Cistercian Maulbronn Monastery (1147) is the most complete and best-preserved medieval monastic complex north of the Alps. Surrounded by fortified walls, the main buildings date between the 12th and 16th centuries. The monastery's church, mainly in Transitional Gothic style, had a major influence in the spread of Gothic architecture over much of northern and central Europe. Its water-management system with an elaborate network of drains, irrigation canals and reservoirs, is of exceptional interest. UNESCO WHS description.