Telephone Pavilion (Expo 67)
The Telephone Pavilion, also known as the Bell Telephone Pavilion and formally named the Telephone Association of Canada Pavilion, was a part of Expo 67, an International World's Fair held in Montreal, Quebec, Canada in 1967 to mark the centenary of the Confederation of Canada. The pavilion was built to promote Canadian telephone companies and their services.
Source: Wikipedia — Telephone Pavilion (Expo 67) (CC BY-SA 4.0)