✈️ Toronto's CN Tower Turns 50 — and It Was Built for Radio Waves, Not the View — Woody Magazine, Jun. 26, 2026
Toronto's CN Tower Turns 50 — and It Was Built for Radio Waves, Not the View
We remember it as the building that was once the tallest in the world. But it was never really a building, and the view was never the point.
On June 26, 1976, a 553-metre concrete shaft opened in downtown Toronto — fifty years ago today. For decades the CN Tower was shorthand for "the tallest thing on Earth," and plenty of people still picture it that way. Yet the most interesting question — why it had to be so improbably tall — rarely comes up. The answer has nothing to do with the view. It has to do with radio.
Toronto grew fast in the 1960s. Its population climbed from one million in the 1950s to 2.5 million by 1970, and glass towers shot up across the core. That boom created an odd problem. The city's broadcast antennas stood under 500 feet, and the new skyscrapers — the Toronto-Dominion Centre and others topping 800 feet — physically blocked their signals. Reflective façades bounced television and radio waves off course. A modern skyline, it turned out, could smother its own broadcasts.
The fix was almost crude in its simplicity: build one antenna taller than every building in the city. The company that took it on was not a broadcaster but a railway. "CN" stands for Canadian National, then the operator of the country's largest rail network. It owned a swathe of surplus rail land downtown and wanted to plant a giant transmission mast there — partly to lease as a communications hub, partly to flaunt Canadian industrial muscle. The project was nearly a joint venture with rival Canadian Pacific, which would have made it the "CN/CP Tower." CP backed out, and the name settled as CN.
This is why, strictly speaking, the CN Tower is not a building. It is a hollow hexagonal column with almost no usable floor space, capped by an antenna — a tower. Guinness World Records once filed it under "tallest building," then reconsidered and split the categories, listing it as a free-standing structure and a tower instead. There simply wasn't enough occupiable floor to call it a building.
That distinction is also the fine print behind "world's tallest." The CN Tower held the record for the world's tallest free-standing structure for 32 years, until Dubai's Burj Khalifa (828 m) passed it in September 2007. The closest reference point may be in Seoul: Lotte World Tower, the city's tallest skyscraper, rises 555 metres — less than two metres above the CN Tower's 553.3. One is a building people live and work in; the other is a tower that beams signals.
The tower built for broadcasting ended up earning its keep from tourism instead. A revolving restaurant and observation decks were bolted on from the start, and CN soon found the structure far more lucrative as an attraction than as a transmission mast. When the railway was privatised in 1995, the tower passed to Canada Lands Company, a federal Crown corporation. Torontonians wanted to keep the "CN" name, so it quietly took on a new meaning: Canada's National. Today the tower still carries more than 17 television and radio stations while drawing over two million visitors a year. Born as infrastructure, it survives as an icon.
A tower rescued by radio is not new. The Eiffel Tower got there first. Built as a temporary structure for the 1889 World's Fair, it was slated for demolition after twenty years. Gustave Eiffel handed it to the French military for wireless-telegraphy experiments and personally financed the antenna. Once radio proved its strategic value, Paris extended the concession in January 1910. Radio saved the Eiffel Tower.
The two towers run in opposite directions. In Paris, radio rescued a tower that already stood; in Toronto, radio called the tower into being. Either way the conclusion holds: the great towers of the twentieth century reached such heights not for the view, but for the signal.
Fifty years on, the most coveted thing at the CN Tower is not its transmission gear but the EdgeWalk. Opened in 2011, it sends harnessed visitors around the rim of the main pod — no railing — at 356 metres, directly above the revolving restaurant. If you ever find yourself up there, the city sliding away beneath your feet, it's worth remembering that this height was meant for radio waves, not for people.
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