Size comparisons

In 1995, the CN Tower was declared one of the modern Seven Wonders of the World by the American Society of Civil Engineers. It also belongs to the World Federation of Great Towers. The following year, the Guinness Book of World Records officially changed the CN Tower's classification to "World's Tallest Building and Free-Standing Structure". Today, the Guinness World Records state the CN Tower as the "Tallest Freestanding Tower". This is because the Petronius Platform oil rig in the Gulf of Mexico is taller, yet most of the rig is underwater.

There are also many guyed towers taller than the CN Tower, the current tallest being the KVLY-TV tower in North Dakota at 628 m (2,063 ft) tall (see List of masts), but these are guy-wire supported structures and not classified as free-standing.

There are currently five proposals for towers whose final heights are to exceed the CN tower's, three of which are currently under construction. At the forefront, the Burj Dubai would, according to present claims by its developers, become a taller free-standing land structure than CN Tower sometime in 2008; work on that tower has, as of October 31, 2006, reached the 80th floor and 277 metres (~908 ft).

View from the tower's Glass Floor.

The builders of the CN Tower did not expect that it would hold the tallest structure record for thirty years. Previous record holders had quickly been supplanted. Several rivals have been proposed and most schemes collapsed. This is partly due to the development of cable television soon after the tower was built which greatly reduced the need for such broadcasting centres, especially in urban areas. Only in cities are there enough tourists to make such a tower viable as a tourist attraction.

Use

The CN Tower has been and continues to be used as a communications tower for a number of different media, and by numerous companies:

Дата добавления: 2015-07-20