Toronto: CN Tower.

“The CN Tower (French: Tour CN) is a 553.3 m-high (1,815.3 ft) concrete communications and observation tower in downtown Toronto. Built on the former Railway Lands, it was completed in 1976, becoming the world’s tallest free-standing structure and world’s tallest tower at the time. It held both records for 34 years until the completion of Burj Khalifa and Canton Tower in 2010. It is now the third tallest tower in the world and 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.”