a lot of landmarks/tourist sites are integral parts of many german cities and not even possible to avoid them, especially the areas that are part of the Altstadt of many cities
in Hamburg I used to pass through Speicherstadt (city of warehouses) often because one of our offices were located in HafenCity : https://en.wikipedia.org/wiki/Speicherstadt
The entire old city centre of Lübeck the capital of the once Hanseatic League, is a UNESCO world heritage site for example https://en.wikipedia.org/wiki/Lübeck
BRB, booking trip to Germany