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This building - similar to a city hall or courthouses in the US was the only building during the bombing campaign during WW2 in Hannover that survived.
Hannover was heavily industrial therefore a major target for the allies. The building is a little over 500 years old.
I know you had a great time. I lived in Germany for 9 years, 4 years in Augsburg and 5 years outside Bamberg (both in Bavaria, bhut Bamberg is in the Oberfranken region of Bavaria).
Their "city hall" (per pic) is called a "rathaus". "Rat" means "council" or "advice". They usually have a restaurant in their basements called a "ratskeller", "keller" meaning "basement", where we get the word "cellar". The English translation for the same thing is called a "rathskeller". FWIW, English is a Germanic language.