May 20, 1976
The Biosphère is a museum in Montreal dedicated to the environment. It is located at Parc Jean-Drapeau, on Île Sainte-Hélène in the former pavilion of the United States for the 1967 World Fair Expo 67.
In the afternoon of the 20 May 1976, during structural renovations, a fire burned away the building’s transparent acrylic bubble, but the steel truss structure remained. The site remained closed until 1990.