The CN Tower, located in Toronto, Ontario, Canada, is a communications and tourist tower standing 553.33m (1,815 ft 5 in) tall. Since its completion in 1976, it has been the world's tallest free-standing structure on land; however, its status as the world's tallest building is contentious. It is considered the signature icon of the city, attracting more than two million international visitors annually.^[1]

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, the CN Tower was transferred to the Canada Lands Company (CLC), a federal Crown corporation responsible for real estate development. Since local residents wished to retain the name CN Tower, the abbreviation is now said to expand to Canada's National Tower^[2] rather than the original Canadian National Tower; however, neither of these are commonly used.