TORONTO - JUNE 29: The CN Tower against a blue sky on June 29, 2012 in Toronto. The CN Tower was completed in 1976 and is the world's tallest free standing structure, standing 553.33 meters tall.
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TORONTO - JUNE 29: The CN Tower against a blue sky on June 29, 2012 in Toronto. The CN Tower was completed in 1976 and is the world's tallest free standing structure, standing 553.33 meters tall.