Cinesphere

Cinesphere is the world's first permanent IMAX movie theatre, located on the grounds of Ontario Place in Toronto, Ontario, Canada. Constructed in 1971, it is the largest IMAX theatre in Ontario. The theatre has both IMAX 70mm and IMAX with Laser projection systems. The theatre is considered a building of heritage value and shows movies each weekend. It is owned by the Government of Ontario, which owns the entire Ontario Place site.

Cinesphere's is a 35-metre-wide triodetic-domed structure, akin to a geodesic dome, with a 19-metre outer radius, and a 17-metre inner radius, supported by prefabricated steel and aluminium alloy tubes. Eberhard Zeidler, who also designed the "Pods" of Ontario Place, also designed Cinesphere. Its screen is 24 metres wide by 18 metres high.