In Bremerhaven is the Schiffahrtsmuseum Bremerhaven, the Maritime Museum Bremerhaven. The museum is focused on German Maritime history in general.
They do have some objects related to World War One and World War Two on display like the midget submarine Seehund, and a German Halftrack, the Sd.Kfz. 11 Raketenwagen, but this is not their focus.
In front of the museum is the museum ship – U boat type XXI U-2540 Wilhem Bauer
Visit
Check out the openings times and the items on display on their website
