This Friedensreich Hundertwasser building is called Waldspirale (which means "forest spiral"... there is a garden all along the roof!) and it is a residential building complex in Darmstadt, Germany, built in the 1990s. Every single window is different. Such a wonderful, whimsical building!
Marina moved to Darmstadt in 2004 and lived there for three years. Her apartment had a huge balcony, and the view was just as it is shown on this postcard! Marina never got a chance to visit Waldspirale, but she still has friends in Darmstadt and thinks it would be a wonderful excursion when she returns as a visitor.