In a way, Seattle has a permanent piece of the paleo-future.

The always amazing blog BibliOdyssey has a great post titled Century 21 Exposition. It features proposed designs for the Space Needle and the fairgrounds for the 1962 Seattle World's Fair (also known as the Century 21 Exposition).

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For an amusing film following teenagers through the expo be sure to check out Century 21 Calling.

See also:
Expo '92
To The Fair! (1965)
Walt Disney Explaining the Carousel of Progress to General Electric (1964)
All's Fair at the Fair (1938)