The CN Tower is a communications and observation tower in Toronto, Ontario, Canada. Standing 553.3 m tall, it was completed in 1976, becoming the world's tallest free-standing structure and world's tallest tower. It held both records for 34 years, or one-third century, until the completion of the Burj Khalifa in Dubai and Canton Tower in Guangzhou. It remains the tallest free-standing structure in the Western Hemisphere, a signature icon of Toronto's skyline, and a symbol of Canada, attracting more than two million international visitors annually.
Its name "CN" originally referred to Canadian National, the railway company that built the tower.
