The World's Fair/Exposition of 1967 was held in Montreal, Canada. The pavilions were very popular making it on of the most notable fairs in history. The expo also used one of the first people mover transportation systems called the "Minimover."
Canada, Montréal, Expo - Biosphere, the US Pavilion for Expo 67 designed by Buckminster Fuller and Shoji Sadao as it caught fire on May From the cover of the catalogue for Hippie Modernism: The Struggle for Utopia.
Mexico Pavilion, Expo Montreal, Defined by a ‘fan’ of hyperbolic paraboloids, the ‘half’ of Mexico’s pavilion for this fair, seen here (the other ‘half’ of the pavilion featured a replica of an ancient Maya structure).