Wall House II is one of Groningen's strangest architectural stops: a built version of American architect John Hejduk's theoretical Wall House design, completed after his death on the city's southern edge. The house is organised around a tall, flat wall that slices through the composition, with bright volumes attached to it like rooms in a diagram.
It is not a conventional museum, and access can vary with exhibitions and cultural programming, so check ahead before making a special trip. Even from outside, it is worth the detour for travellers interested in experimental architecture, postmodern design, or the way Groningen uses its suburbs as a laboratory for bold housing ideas.