Trier is a small city in southwest Germany, very close to Luxemburg. It has an excellent location along the Moselle River. At first sight, it looks like a 'normal' German town, but you don't have to walk far to come eye to eye with Trier's Roman heritage. There's even so much of it that you get the impression that by accident you've been stranded in a German town in Italy.
There's a lot to see here, so I'll name some of the highlights. The large Dome of course, and the baths. And, somewhat out of the center of town, the huge Amphitheatre.
Really interesting also is the regional museum. One room there exhibits large mosaics in good condition that have been found in Trier. At the heart of the museum, an ornamented light blue grave monument is the centerpiece of the attraction. How beautiful the streets of Trier must have looked in Roman Times!