On Day 10 we visited more government offices and had additional meetings (something we did most days on the trip). However because of some extra time we opted to take an unscheduled visit down to Koln to see the famous Cathedral.
When exiting the train station the cathedral is immediately to the left. It is a massive building and I wasn't able to get a picture of the entire building. In the pictures below you can see a portion of the cathedral.
Remains of a wall built by the Romans. Koln was as far north as the Romans ever got in the conquests during their Imperial reign.