Art Deco Chicago
Chicago is very cool. I spent a really fun weekend there, and took the Art Deco walking tour (which I highly recommend, by the way. They are given by the Chicago Architecture Foundation.), which give a great overview of a very exciting time in Chicago's architectural history.
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That last one is actually called "Echo Deco", which is a modern building built in the Art Deco style. It's built as an homage to a building design that was submitted to the Chicago Tribune for it's competition in the 1920s.
This is the building that won:
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But it's a beautiful city. I wish I'd had more time to see it, so I hope to go back.