<Tr> <Td_colspan="2"> www.cntower.ca </Td> </Tr> <Tr> <Th_colspan="2"> References </Th> </Tr> <P> The CN Tower (French: Tour CN) is a 553.3 m - high (1,815.3 ft) concrete communications and observation tower located in Downtown Toronto, Ontario, Canada . Built on the former Railway Lands, it was completed in 1976 . 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 . </P> <P> The CN Tower held the record for the world's tallest free - standing structure for 32 years until 2007 and was the world's tallest tower until 2009 being overtaken by Burj Khalifa and Canton Tower, respectively . It is now the ninth tallest tower in the world and remains the tallest free - standing structure in the Western Hemisphere . In 1995, the CN Tower was declared one of the modern Seven Wonders of the World by the American Society of Civil Engineers . It also belongs to the World Federation of Great Towers . </P>

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