I got a month-long scholarship in college in 2012.
I had gone to Aachen in Germany. Aachen is near to Köln in an hour's distance.
So I didn't want to return without seeing the dom church. It has got a wonderfull
architectural structure. It seems maybe small but really impressive. It is the tallest church tower in the Netherlands with 112.32 meters.
This building started to build in 1281 but it completed in 1382. An influential masterpiece of a hundred years. There isn't much to say. It's worth to seeing. I advice that. 
If you want some information about dom church;
https://www.iasc2017.org/where/venues/dom-church/
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Sir, please see my profile
I'm not a sir 🙂