Visit the French National Car Museum and the associated Train Museum when you visit Mulhouse.
It is one of the best in Europe.
You could visit Ettlingen when you drive north from Baden-Baden.
The road from Baden-Baden to Gernsbach to Bad Herenalb, to Marxell to Ettlingen is much nicer than the A5.
There is a car/motorcycle museum in Marxell that is entertaining to visit.
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