Trier on the banks of the Moselle, in the Rhineland-Palatinate region of Germany, is the country's oldest city, dating from Roman times. In 2019, it had 112,000 inhabitants.
Trier is rich in ruins from the Roman Empire (protected by UNESCO), such as the Porta Nigra, the Roman baths and Roman amphitheater. As Trier was founded by the Romans as Augusta Treverorum, it can claim the title of "oldest German city". And unlike the somewhat provincial and quaint feel the town exudes today, it was actually one of the centers of power during the Imperial Crisis of the Third Century and certainly the most important Roman town of the province of Germania.
Besides its ample Roman heritage, Trier is also known as the birth place of Karl Marx, a fact that the city has had difficulty grappling with during more anti-communist times but now widely markets for tourism.