Unité d'Habitation -- Marseille, France (1952)
Nicknamed the “Nutter’s House” and “The Radiant City,” this Corbusier design set off the Brutalism trend. A massive set of flats that to this day remains a blueprint for human-centered design and accomplished urban architecture, it ,may appear monolithic, but a wealth of details -- such as stained glass windows in the entrance hall, communal space and spacious two-level apartments -- have not only made it a UNESCO Heritage site, but still a sought-after address to this day. Photo courtesy Ken OHYAMA, Creative Commons.