The face of Trier was shaped by the Roman era. The most famous relic is the Porta Nigra (Black Gate) from the 2nd century. The Imperial Baths was a bathing palace of the first half of the 4th century and even then ranked as one of the largest thermal spas in the Roman Empire.

The Amphitheatre, a Roman arena for fights of gladiators and animals was built around 100 A.D. and had a seating capacity for around 20,000 people.

UNESCO has declared the Barbara Baths, Forum Baths, Roman Throne Room (Basilica) and the St. Peter’s Cathedral as treasures of world civilization.