Robert Mills, a Greek Revivalist architect, designed the U.S. Treasury building & this 555-foot-tall structure
.... Robert Mills was commissioned to design the T-shaped Greek Revival 
..... At the time of its completion it became the world's tallest structure at 555 ft 51/
8 in... [DOC] [TLE] DC Inventory of Historic Sites photos on Flickr | Flickr [PAR] The top photo was taken in 1959 by the Historic American Buildings Survey (via 
the Library ...