Cologne Central Station (Hauptbahnhof) is one of the most interesting places, especially during carnivals. It is here where all kinds of characters arrive. That in general, because I asked a lady where she had bought that mustache and said the passage of time had given it. Glup. Earth, swallow me. Or, Rhine River (a few meters) take me away ...
There is a bridge behind the Cologne Cathedral train station where you can find thousands of locks left there by lovers. Besides the impressive number of locks, you can enjoy an alternative view of the Cologne Cathedral from the bridge and a good walk in the park by the Rhine river.
Even if you're not waiting for a train it's worth visiting just for the adventure this station may offer. Anything from shopping, food or even just people watching.
