Upvote:1
If you would fly to Venice, then most of Germany is within range. The Rhine. Berlin. The North Sea coast.
You can reach the Alps. Hike up mountains in view of the really steep peaks.
Rothenburg, but depending on the season you might meet many other tourists. (Attention, there are several towns with this name.)
You might also look for a "genuine" little German town, but those have few interesting museums.