Drobeta-Turnu Severin – usually shortened to 'Severin' in conversation – is on the bank of the Danube River bordering Serbia. Though the modern city was laid out in the 19th century, the town has a rich history stretching back nearly 2000 years, when it was an important Roman colony with a population of some 40,000. It’s best known as the base of Roman emperor Trajan’s colossal bridge across the Danube. You can still see ruins of the bridge as well as part of the Roman town surrounding it.