Just found out, that one of the few remaining still operating Zuse Z22 computers are standing in one outpost campus of the Ostfalia university, just one hour on the road B4 to the north, in the middle of the Lüneburg Heath ... Maybe I can find out when it will be booted again, should be interesting to still hear a drum memory/vacuum tube/core memory machine launch.
The Z22 was pretty popular at universities for some years, as early affordable computer (Did still cost the university 10,000 DM in 1970 to buy a used one). Also it was the reason why the German dub of "2001" had HAL sing "Hänschen Klein" instead of "Daisy Bell", because some years before, a Z22 already sang this German childrens song with some public notice. (The Z22 had a speaker as output device for debugging, which produced sounds based on the current state of the machine - and technicians used this speaker already early for electronic voice and sound experiments)