A short walk south of the old town, on the modern recreation lake, sits the foundation of a Roman villa rustica that is one of the largest known north of the Alps. The site is presented as an open-air ruin under a protective roof, with explanatory panels and a small interpretive centre.
What survives is mostly the floor plan and lower courses of walls, plus mosaics and the impressive remains of the bath-house with hypocaust pillars still in place. The scale is the point: this was the country estate of a wealthy provincial Roman family in the 2nd and 3rd centuries, and the size of the bath complex and the number of reception rooms suggest the owners were near the top of regional society. Combined with the Prehistory Museum in town and the basilica, it tells a continuous story of occupation from the Bronze Age through the early Middle Ages.