A Modern Castle With 1,000 Uniquely-Shaped Windows - Architecture - io9 [It was] designed by Austrian artist, Friedensreich Hundertwasser, and built during the 1990s … Its diagonal roof is covered with grass, shrubs and trees and the facade follows an irregular grid organization. Waldspirale has over 1,000 windows, but no two are the same. The handles on the apartment doors and the windows are also unique.

A Modern Castle With 1,000 Uniquely-Shaped Windows - Architecture - io9

[It was] designed by Austrian artist, Friedensreich Hundertwasser, and built during the 1990s … Its diagonal roof is covered with grass, shrubs and trees and the facade follows an irregular grid organization. Waldspirale has over 1,000 windows, but no two are the same. The handles on the apartment doors and the windows are also unique.