What happened in the 1970s?
š¢ Architectural Marvels: Completion of the CN Tower in Toronto, the tallest freestanding structure at the time (1976)
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Further Reading
CN Tower - Wikipedia (wikipedia.org)
History - CN Tower (cntower.ca)
Was the CN Tower once the tallest free-standing structure in ... - Quora (quora.com)
Awards and records | CN Tower (cntower.ca)
CN Tower | Skyline, Landmark, Iconic - Britannica (britannica.com)
Building the CN Tower: History & Facts - DOZR (dozr.com)
Review of CN Tower in Toronto, Canada - AFAR (afar.com)
CN Tower: Toronto's Skyline Beacon and Architectural Wonder (mapquest.com)
Striving to the top: buildings, structures, and languages (applelanguages.com)
First Canadian Place: 40 years on top in Toronto (spacing.ca)