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| | List of tallest buildings and structures in the world - Wikipedia, the free encyclopedia |
 | | While determining the world's tallest structure has generally been straightforward, the questions of what is the world's tallest building or the world's tallest tower have often been controversial, both because of disputes over what counts as a building or a tower, and further disputes over how to measure the height of these. |
 | | Another example of a structure that's not self-supporting is a captive balloon, a long rope tethered to the ground on one end and to a helium balloon on the other. |
 | | The World Trade Center became the world's tallest buildings to be demolished–indeed, its site entered the record books twice on September 11, 2001, in that category, replacing the Singer Building, which once stood a block from the WTC site. |
| en.wikipedia.org /wiki/Worlds_tallest_structures (2149 words) |
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