Great tourist card from Bremen. However, the sender is from Gifhorn, which I have never heard of. Gifhorn is a city of 42 000 and is a part of the Hanover-Brunswick-Göttingen-Wolfsburg Metropolitan Region . Gifhorn is home to the International Wind and Watermill Museum ( Internationales Mühlenmuseum) . It is the only one of its kind in Europe. The museum covers about 16 hectares and there are about 16 mills from 12 countries (2009). The mills are faithful reproductions or the original mill.  The museum opened in 1980. Terrain was landscaped and numerous ditches and ponds were created, including a 5 hectare lake. All the mills work.