The old Roman city of Trier is still visible today, the remains of the hot springs, the Constantin's Basilica and the world-famous "Porta Nigra", an imposing town-gate, which was developed in the end of the second century A.D. It is among the best preserved monuments of the Romans in Germany.
The medieval cathedral with its important treasury and the Church of Our Lady (ca. 1270) bear witness to the importance of Trier in the Middle Ages.
From more recent history, Karl Marx's birthplace lies near the pedestrian zone. A walk along the Moselle is worthwhile in itself.
Trier is surrounded by wonderful vineyards and forests and the wine terraces of the Moselle, Saar and Ruwer rivers produce important wines annually.