Knuffingen
 

Yes, Miniatur Wunderland is a fantastic attraction. Amazing attention to detail, massive exhibition space in one of the old port warehouses. Brilliant if you have kids with you, especially on a rainy day in Hamburg. Allow plenty of time though; the exhibition is pretty big. And you can enjoy it regardless of which language(s) you speak; fluent German not essential. Massive railway / shipping / cityscape exhibition as well as the model airport. I wish they would open a subsidiary here in Manchester!