Metz is the capital of the historic Lorraine region — about
120,000 people sitting on the Moselle, an hour southwest of
Luxembourg and an hour from the German border at Saarbrücken. The
city has been Roman, French, German (1871-1918 and 1940-44), and
French again, and the historic core mixes 13th-century Gothic, a
grand 19th-century Wilhelmine Quartier Impérial built by the
Germans, and Shigeru Ban's 2010 Centre Pompidou-Metz on the
edge of it.
For a student group, Metz is the underrated French cathedral
city. Saint-Étienne has more stained glass than any other Gothic
cathedral in France (about 6,500 square meters), the historic
center is fully walkable in a long morning, and the Centre
Pompidou-Metz is the strongest contemporary art museum in
eastern France. It pairs cleanly with Strasbourg (a TGV ride
away) or Luxembourg City (35 minutes by regional train) on a
teacher-led trip, and is one of the few French educational
travel stops where a student group can cross a national border
by lunch and be back for dinner.