Germany/France Day Trips

From Berlin:

Sachsenhausen and Ravensbruck Concentration Camps

Luebeck

Quedlinburg

Spreewald

Dresden

From Stuttgart:

Tuebingen (I would pick this over Baden-Baden as it is far more interesting)IMHO

There is a ton of stuff to see around Stuttgart. Palaces, cars, festivals, etc. There is a guy named Marko over on Trip Advisor that has links to all of these, so make a visit to that website too.

Munich, Ludwig's castles or Dachau.

Chateau de Versailles, Chartres, Fontainbleau, even London can be done as a long daytrip from Paris. From Munich, Salzburg would be my choice.

First, there are a lot of things in and around Munich - the castles near Fuessen and Salzburg are both possible day trips, Rothenburg ob der Tauber would me best as an overnight trip, Wuerzburg, Nuernberg. If you don't want to go all the way to Rothenburg, Noerdlingen is similarly walled, smaller, and less touristy. You could go by train in a single day to Oberammergau and Mittenwald. I'd skip Garmisch-Partenkirchen - too big.

From Stuttgart, instead of Baden-Baden (too big, touristy, most of the town lacking charm), I'd go to Freudenstadt, which is called the capital of the northern Black Forest.

You can get to it by train. Tuebingen would be nice. I had an enjoyable lunch watching the punts on the Neckar from a riverside cafe.

Another trip from Stuttgart could be to Burg Hohenzollern, in Hechingen, a contemporary castle to Neuschwanstein, built by Kaiser Wilhelm I.
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If you leave Stuttgart on the 10:15 train to Hechingen, you'll get there in time to catch the 11:22 bus to the castle. A Baden-Wuerttemberg-Ticket will cover the round trip train plus the bus to and from the castle.

Another possibility is Calw, also in the Black Forest, the home of Herman Hesse.
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You can get there from Stuttgart by going by train to Pforzheim, then taking another train up the Nagold river to Calw.

Aix en Provence - Cassis, hill towns of the Luberon, Pont du Gard, Arles, St Remy

Also market days in Provence - Friday in Lourmarin is outstanding

Tours - Villandry, Chenonceau, Chinon

Paris - Giverny, Chartres

Also from Paris - Reims. The Notre Dame Cathedral there is so beautiful. If you like champagne, this town is the place to visit!

Thanks for your wonderful suggestions forumers!!