I don’t know the difference between an Expo and a World’s Fair and at this point I’m afraid to ask. However, I’ve been to Expo 67 in Montreal and the 1964 New York World’s Fair and thoroughly enjoyed them both. I have long been intrigued by Expo 58 that was held in Brussels and visited the site decades after the event.
But now a wonderful interactive website makes a visit possible. Expo 58: is a trip back in time by 55 years and an opportunity to experience a digital recreation of the 1958 Expo which was the first big international exhibition-type event after WWII. It brought together nations and international institutions to present their vision for a utopian future born from the ashes of conflict. This site lets you take a tour in glorious 3d-modeled CG through the various pavilions of the original Brussels site, accompanied by descriptions delivered by avatars. It’s fun, interesting, well-presented, and also educational. A big thank you to historian Dr. Anastasia Remes of the European Research Institute for creating the website.
Travel Between The Pages 
I remember when I visited a small town in Belgium called Wevelgem, that the local college is housed in the Czechoslovakian pavilion that featured at this expo. The then director of the school had building plans and decided that he could reduce the cost of his ambitions by just purchasing this building once the expo came to its end. I wonder how the other pavilions feared. I believe that most of them just ended up being scraped while the Czechoslovakian pavilion still stands and serves as an educational institution.
There is no difference between the International Expo’s and the World Fairs, organizers intentionally make them difficult and confusing to classify for camouflage. In reality they are a single entity that spans almost 200 years and every continent. It is the installation of a centralized international authority. They provided the opportunity for all nations to gather and fraternize without drawing negative attention to themselves, use the Bohemian Grove elite functions as an example. The fairs also was a way to showcase certain inventions and architecture that helped solidify the power structure. I got tons of info if you really want to know.
Sounds like the plot of a Thomas Pynchon novel.
I wish I could have gone to any of the Brussels Expo’s, Antwerp had one in 1894 that I’ve always been fascinated by.