Historian Jamie Bradburn looks back on celebratory day the CN Tower finished its main construction, becoming world's tallest ...

A model of the CN Tower is put on a scale in an elevator in the CN Tower. As the elevator descends the weight of the model at first decreases and then returns to normal as the elevator continues down.

Construction on the CN Tower started in 1973, originally designed to serve as a telecommunications tower to transmit signals far and wide, as skyscrapers had started interrupting communication in ...