Metz is close enough to be one of the easiest full immersions into French culture and food available from the Ramstein/KMC area -- about an hour's drive, genuinely walkable once there, and refreshingly uncrowded compared to bigger-name French destinations like Strasbourg.
The centerpiece is the Cathedral of Saint-Etienne, built between 1220 and 1522, with a 42-meter nave making it one of the largest Gothic buildings in Europe. Its 6,500 square meters of stained glass have earned it the nickname "God's Lantern" -- and near the back of the cathedral, a set of windows by Marc Chagall (the same artist behind the windows in Mainz's St. Stephan's Church) add a striking, unmistakably modern touch to the medieval space.
A short walk away, the Centre Pompidou-Metz -- a branch of Paris's famous modern art museum -- occupies a strikingly designed building with an undulating roof inspired by a Chinese hat, hosting rotating exhibitions from the French National Museum of Modern Art's collection. Between the two, the historic Covered Market and the German Imperial Quarter (built 1871-1914 when Metz was part of the German Empire) round out a full day of contrast -- Gothic, imperial, and thoroughly modern architecture within a short walk of each other.
What to See
Cathedral of Saint-Etienne (look for the Chagall windows near the back), Centre Pompidou-Metz, the Covered Market, and the German Imperial Quarter.
Food
The historic Covered Market has local food producers and retailers; French cafes and restaurants throughout downtown, with a noticeable step up in food quality and variety compared to typical German small-town options.
Tickets
The cathedral is generally free; Centre Pompidou-Metz has a separate paid entry.
Best Time to Visit
Spring through fall for comfortable walking conditions between sights.
Local tip: Cathedral entry is typically free -- be respectful of anyone visiting for prayer. USO tours to Metz are sometimes available as an alternative to driving yourself. Wander off the main tourist streets for more authentic, less touristy food and shopping.