Quick stop in Cologne

I'm taking an overnight train from Copenhagen on my way to Bruges (or at least that's the plan). Bruges isn't a big enough town where I can get a direct train ride from Copenhagen. One of my choices for stops was Cologne. From there, I can get to Bruges in a couple hours. But after talking to someone about Copenhagen, she immediately said that if I do anything in Cologne, I should go see the cathedral that is right outside the train station. Judging from the pictures, she was right. I didn't want to be rushed, so I decided to stay a night in Cologne.

$57.