Originally founded in the early 12th century, the Cistercian Maulbronn Monastery is considered the most complete and best-preserved medieval monastic complex in this region. The complex is surrounded by fortified walls with its main buildings constructed between the 12th and 16th centuries. The monastery’s church, primarily in Transitional Gothic style, had a major influence in the spread of Gothic architecture over much of northern and central Europe. The water-management system at Maulbronn, with its elaborate network of drains, irrigation canals and reservoirs, is of particular historic interest. It is a bit of a drive from the Rhine River, but there may be a river cruise itinerary that includes an excursion to this historic treasure.