The CN Tower is Toronto’s tallest and most defining landmark. Photos of Toronto are often defined by the building, which stretches more than 550 metres into the sky.

Today, aside from serving as a hub for telecommunications across the city, the CN Tower has become a major tourist destination. Visitors can test their courage by walking across the glass floor 113 stories above the ground. The first of its kind in the world, the glass floor gives you that dare-to-walk-on-air experience, with only 2.5 inches of glass holding you 342 metres in the air. The glass floor is actually stronger than most commercial floors and has the strength to hold 38,556 kg (85,000 lbs) or 14 hippos! Or, if you dare, travel higher up the tower to the Sky Pod, another 33 storeys above ground.

Its name "CN" originally referred to Canadian National, the railway company that built the tower. Following the railway's decision to divest non-core freight railway assets, prior to the company's privatization in 1995, it transferred the tower to the Canada Lands company, a federal Crown corporation responsible for real estate development. Since the name CN Tower became common in daily usage, the abbreviation was eventually expanded to Canadian National Tower or Canada's National Tower. However, neither of these names is commonly used.