List of tallest buildings
The international non-profit organization Council on Tall Buildings and Urban Habitat (CTBUH) was formed in 1969 and announces the title of "The World's Tallest Building" and sets the standards by which buildings are measured. It maintains a list of the 100 tallest completed buildings in the world. The organization currently ranks Burj Khalifa in Dubai as the tallest at . The CTBUH only recognizes buildings that are complete however, and some buildings included within the lists in this article are not considered finished by the CTBUH.
List of tallest buildings and structures
The Petronius Platform stands off the sea floor leading some, including "Guinness World Records" 2007, to claim it as the tallest freestanding structure in the world. However, it is debated whether underwater height should be counted, in the same manner as height below ground is ignored on buildings. The Troll A platform is , without any part of that height being supported by wires. The tension-leg type of oil platform has even greater below-water heights with several examples more than deep. However, these platforms are not considered constant structures as the vast majority of their height is made up of the length of the tendons attaching the floating platforms to the sea floor. Despite this, "Guinness World Records" 2009 listed the Ursa tension leg platform as the tallest structure in the world with a total height of . The Magnolia Tension-leg Platform in the Gulf of Mexico is even taller with a total height of .