Interesting KK thanks for sharing that, Cologne is not too far from here and I have visited it a few times, more so I visit Aachen which is on the way to Cologne.
When I visited Queens' College in Cambridge a few years ago I found it difficult to wrap my mind round the fact that the building I was looking at was built during the reign of Henry VI. It looked like it could have been built in the 1950s or so but dated back to the 15th century. There is a hotel, rather a coaching inn, I used to stay at in the village of Aynho which was built in the 1200s all low ceilings and thick beams to support the upper floor.
Now Belgium is a bit different in that they knock down and rebuild in a regularly, so much so that they built
Bokrijk so that they could rescue old buildings that were in danger of being recycled, with the sandy ground here lots of archaeology disappears into the sand, and people monitor their buildings for subsidence incase they settle too far into the ground.
Visiting Pevensey Castle which I thought was from about the time of Edward 3rd but it turned out most of the structure was Roman and Edward had just built the larger keep inside the existing Roman walls. Hah! got that wrong, I meant Porchester Castle but the same applies they were both originally Roman forts which were incorporated into medieval castles, both are worth visiting, Pevensey castle also has WW2 pill boxes cunningly installed in broken sections of wall and even close up it is difficult to spot some of them.
https://en.wikipedia.org/wiki/Pevensey_Castle https://en.wikipedia.org/wiki/Portchester_Castle On my future wife's first visit to me in the UK I took her to visit Porchester Castle. Thank goodness she loves that kind of thing