In October I had the opportunity to visit The Hundertwasser House in Vienna. Fredrick Hundertwasser was an artist and an architect, he disliked straight lines and his work is very free form. The apartment complex is currently public housing, and is located down an alley.
There are trees and plants growing out of the building (on purpose), it's very colorful and hard to get good pictures because of it's alley location.
Even the sidewalks in the alley undulate.