While in Germany a few months ago, i picked up this great book, 'Exit to Tomorrow: World's Fair Architecture, Design, Fashion 1933 to 2005' ed by Andrew Garn it a survey of the hey day of world's fair and expos.

Above are some images a poster advertising the 1933 Chicago World's fair 'A century of Progress'

2 future fashion designs from the 1939/40 New York world's fair

A model of 'The City of tomorrow' from 1964 New York, World's Fair.

This period of world fairs provided an ideological platform for propaganda by nations and various companies, a means of selling and competing on grand scale. Very different from the modern, scaled down, thematics expos of today.

Expo 2008 is in the spanish city of Zaragoza.