What should we be sure to see while driving between Paris and Stuttgart?
Hi, Strasbourg is my first recommendation, one of my favourite cities in France. Between Metz and Strasbourg, no question ....Strasbourg. Second place en route to Paris is Reims, not only for its WWII history but its cathedral.
Verdun is not far off the A4 and a fascinating place. Strasbourg is great, then head north from there through Bischwiller and Soufflenheim, then cross back to the A5 at Iffezheim (hwy 500).