After Sarah left, I decided to escape impending loneliness by running off to Berlin for New Year's Eve, known in German as Silvester. (When a ticket there costs 25.50€, this isn't hard to do.) Let's just say it was well worth it.
Suffice to say we stayed up pretty late and slept in pretty late, but still got up early enough to have time to head to a museum. We wanted to go to the Neues Museum (New Museum, known for its Egyptian collection) but it was already sold out for the day. We went to the Altes Museum (Old Museum, known for its Greek collection) instead, and that was cool enough. The whole Museuminsel (Museum Island) is a pretty great place to hang around, constantly busy and worthily cited as a UNESCO World Heritage Site in its entirety.
Welfenschloss, too, although I'm at the Fachhochschule, not the actual Uni.)
If Berlin is the most culturally intense place in Germany, Potsdam is the most architecturally astounding. For a city that really isn't all that big, it has more incredible parks and palaces that any other place I've heard of (except Versailles, which I haven't seen), at least on a per capita basis. Well worth the short trip outside Berlin.