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The world's tallest artificial structure is the tall Burj Khalifa in Dubai, United Arab Emirates. The building gained the official title of "Tallest Building in the World" at its opening on January 4, 2010. It is followed by the Tokyo Skytree, as the tallest tower, and the KVLY-TV mast. The Council on Tall Buildings and Urban Habitat, an organization that certifies buildings as the "World’s Tallest", recognizes a building only if at least fifty percent of its height is made up of floor plates containing habitable floor area.〔(【引用サイトリンク】url=http://www.ctbuh.org/HighRiseInfo/TallestDatabase/Criteria/tabid/446/Default.aspx )〕 Structures that do not meet this criterion, such as the CN Tower, are defined as "towers". There are dozens of radio and television broadcasting towers which measure over 600 metres (about 2,000 ft) in height, and only the tallest are recorded in publicly available information sources. == Debate over definitions == The assessment of the height of artificial structures has been controversial. Various standards have been used by different organisations which has meant that the title of world's tallest structure or building has changed depending on which standards have been accepted. The aforementioned Council on Tall Buildings and Urban Habitat have changed their definitions over time. Some of the controversy regarding the definitions and assessment of tall structures and buildings has included the following: * the definition of a structure, a building and a tower * whether a structure, building or tower under construction should be included in any assessment * whether a structure, building or tower has to be officially opened before it is assessed * whether structures built in and rising above water should have their below-water height included in any assessment. * whether a structure, building or tower that is guyed is assessed in the same category as self-supporting structures. Within an accepted definition of a building further controversy has included the following factors: * whether only habitable height of the building is considered * whether communication towers with observation galleries should be considered "habitable" in this sense * whether rooftop antennas, viewing platforms or any other architecture that does not form a habitable floor should be included in the assessment * whether a floor built at a high level of a telecommunications or viewing tower should change the tower's definition to that of a "building" 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「List of tallest buildings and structures in the world」の詳細全文を読む スポンサード リンク
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