Where to start...Berlin is a great place, but a bit crowded. If you're looking for some culture, Potsdam and Leipzig are worth visiting, too. And of course, my hometown Magdeburg also has it's sights.
I haven't spent much time in the South, so I can't speak from experience.
It's a bit hard for me to list sights because, damn, there's so many of them. But travelling through all of Germany is a good idea; there's interesting things to see and do everywhere.
Gatac
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Katy: Can I have the skill 'drive car off bridge and have parachute handy'?
Justin: It's kind of a limited skill.
Greg: Depends on how often you drive off bridges.
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