Trier is an historic city and wine town in the Upper Mosel in the Ruwer region of southwestern Germany near the Luxembourg border. It was once part of the larger Mosel-Saar-Ruwer wine region. Trier was founded by the Romans, and contains several well-preserved Roman structures like the Porta Nigra gate, the ruins of Roman baths, an amphitheatre just outside the centre and a stone bridge over the Mosel. The Archaeological Museum displays Roman artifacts. Among Trier’s many Catholic churches is Trier Cathedral.