Set where the Moselle River meets the Rhine, some 79 mi/127 km northwest of Frankfurt, Koblenz, Germany, offers an impressive waterfront and a number of graceful 17th- and 18th-century buildings.

One such standout is the market in Koblenz, one of Germany's oldest cities, nestled on the banks of the Rhine and the Moselle. Each year during Advent, the historic city is transformed into an ...