The main part of downtown Chicago south of the river is known as 'The Loop' - and is surrounded by an elevated train that runs in a loop, hence the name.
The Rookery - Burnham and Root 1888, updates by Frank Lloyd Wright and William Drummond
'Four Seasons' public mosaic by Marc Chegall, 1974
Carson, Pirie, Scott, Building, Chicago, by Louis Sullivan (ignore the Target store), 1899
Tiffany & Co glass mosaic ceiling in the former Marshall Field and Company Building, 1907
Untilted by Picasso, 1967
Chicago by Joan Miro 1981