A world's fair built on islands drew more than 50 million visits.

Expo 67 opened in Montreal in April 1967, the year Canada marked 100 years since Confederation. Much of the site sat on islands in the St. Lawrence River, including one built from scratch.

Dozens of nations built pavilions showing off architecture and ideas, from Buckminster Fuller's geodesic dome to the Habitat 67 housing complex.

When Expo 67 closed on October 29, 1967, it had recorded more than 50 million visits and given Canada a new place on the world stage.

Which world's fair or landmark would you have loved to visit?

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