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7 Wonders of the Modern World

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CN Tower

From 1976 to 2007 (when it was surpassed by the Burj Dubai), the CN Tower was the world's tallest freestanding structure. It looms about one-third of a mile high (1,815 ft) above Toronto, Canada. A glass floor on the observation deck lets you look 1,122 ft (342 m) down to the ground.

Next: Panama Canal

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