
Crown Hall at the IIT in Chicago
Ludwig Mies van der Rohe, 1950-56

Yale University Art Gallery, New Haven
Louis Kahn, 1951-53
HEW headquarters in Hamburg
Arne Jacobsen, 1966
New National Gallery, Berlin, Germany
Mies van Der Rohe,1968
United Nations Headquarters, New York
Le Corbusier, 1947-1952
The former IBM building, Chicago
Mies van der Rohe, 1973
Post office at Chicago Federal Center, Chicago
The Office of Ludwig Mies van der Rohe in 1959-74
German architectural photographer,Hagen Stier is one of my favorites.
All images are protected under copyright laws. Here you can find Hagen's website and Flickr.