The CN Tower is a 553.3 m-high (1,815.3 ft) concrete communications and observation tower in Toronto, Ontario, Canada. Completed in 1976, it is located in downtown Toronto, built on the former Railway Lands. Its name "CN" 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 the government's real estate portfolio.
The CN Tower as seen from the Toronto City Centre Airport in September 2008, it is currently the world's 10th tallest free-standing structure
CN Tower from the Toronto Islands
Skycrane "Olga" lifting antenna segment
Constructing the base, July 1973
A tower is a tall structure, taller than it is wide, often by a significant factor. Towers are distinguished from masts by their lack of guy-wires and are therefore, along with tall buildings, self-supporting structures.
Tokyo Skytree, the tallest tower in the world
Azadi Tower in Tehran, Iran; an example of Iranian architecture of various periods
Roman tower (reconstruction) at Limes – Taunus / Germany
Eiffel Tower in Paris
