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| | World's tallest structures (Site not responding. Last check: 2007-11-01) |
 | | The CN Tower in Toronto stands at 553.33 m (1,815 ft) tall, and it is the tallest freestanding structure above ground. |
 | | The Sears Tower still leads in the fourth category with 527 m (1,730 ft), previously held by the World Trade Center until the extension of the Chicago tower's western broadcast antenna in 2000, over a year prior to the Trade Center's destruction in 2001. |
 | | The proposed solar chimney referred to as Solar Tower Buronga in Buronga, New South Wales, Australia would be 1,000 m (3,281 ft) tall. |
| www.abitabouteverything.com /files/w/wo/world_s_tallest_structures.html (2032 words) |
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