#10: Montreal Biosphere (Montreal, Canada)
Originally the U.S. Pavilion at Expo ’67, the Biosphere was a geodesic dome. Designed by Buckminster Fuller, it was never intended as permanent. A fire damaged it years later. Restoration repurposed it as an environmental museum. Its structure remains visually iconic. The dome symbolizes sustainability today. Temporary innovation became educational infrastructure. Architecture outlived its assignment.

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