Rostock. 7 hours northeast of Cologne by train, just inland from the East Sea. It's an old Hanseatic City that still has chunks of the old city wall standing, and you can even walk along a part of it. There's all kinds of old historic buildings, and one of the coolest looking churches I think I've seen here. You can tell it was built by sea traders somehow, because it's huge and looks like it could be used for a trading center or something.
My train ride took me back through Bremen and into Hamburg, where I had to transfer to a regional train for the last leg up to Rostock. Apparently it's a very popular tourist destination on weekends and holidays because all the seats were full and most of the entryways were packed too. I ended up standing for 2 1/2 hours with a loud and energetic soccer team.
