Wetzlar

Wetzlar has a nice old town with a lot of half-timbered houses. Like everywhere else in Germany, Goethe lived there for a brief time. Two of his friends who lived there influenced his book The Sorrows of Young Werther, and you can visit their houses.

some half-timbered houses

Tuebingen

We went to Tübingen on one of the few summery days this year. We walked around the old town and saw parts of the university, where Kepler, among others, studied. We had lunch at a restaurant on the river, then walked around some more and up to the castle. The castle has nice views over the city and a museum that includes a prehistoric horse figurine.