The Canton Tower, or Guangzhou Tower (simplified Chinese: 广州塔; traditional Chinese: 廣州塔), formally Guangzhou TV Astronomical and Sightseeing Tower (Chinese: 广州电视台天文及观光塔), is a 595.7 metres (1,954 ft) tall multi-purpose observation tower in the Haizhu District of Guangzhou (historically known as Canton or Kwangchow), Guangdong, China. The tower was topped out in 2009 and it became operational on 29 September 2010 for the 2010 Asian Games. The tower briefly held the title of tallest tower in the world, replacing the CN Tower, before being surpassed by the Tokyo Skytree. It was the tallest structure in China prior to the topping out of Shanghai Tower on 3 August 2013. It is now the second tallest tower and the fifth-tallest freestanding structure in the world.
[2017-06-22 Wikipedia Canton Tower]
this structure are called Hyperboloid of One Sheet. They are made of straight lines.
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