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49-615: At 24 stories and 348 feet (106 m) tall, the library's main building is the second tallest library in the world after the National Library of Indonesia in Jakarta . Shanghai Library was originally established in 1952. In 1958, Shanghai Library merged with Shanghai Science and Technology Library (formerly Mingfu Library), Shanghai Newspaper Library (formerly Hongying Library), and Shanghai Historical Documents Library (formerly United Library), which were all of considerable size at

98-538: A cost of 4150 million NOK , or approximately US$ 650 million at the time. The base and the deck were built separately, and were joined in 1998 while the base was partially submerged. The base is a Condeep gravity base structure built from reinforced concrete . The Troll platform was towed over 200 kilometres (120 mi) from Vats , in the northern part of Rogaland , to the Troll field , 80 kilometres (50 mi) north-west of Bergen . The tow took seven days. In

147-614: A flagpole is not an integral architectural part of a building, One Times Square was not generally considered to be taller than the 390-foot-high (120 m) Park Row Building in Lower Manhattan , which was therefore still New York's tallest . A bigger controversy was the rivalry between two New York City skyscrapers built in the Roaring Twenties —the Chrysler Building and 40 Wall Street . The latter

196-408: A previously undefined "main entrance"), building completion (must be topped out both structurally and architecturally, fully clad, and able to be occupied), condition of the highest occupied floor (must be continuously used by people living or working and be conditioned, thus including observation decks , but not mechanical floors ) and other aspects of tall buildings. The height is measured from

245-512: A shorter height when both buildings' spires are not counted in their heights. Although the architects of record for 40 Wall were H. Craig Severance and Yasuo Matsui , the firm of Shreve & Lamb (who also designed the Empire State Building ) served as consulting architects. They wrote a newspaper article claiming that 40 Wall was actually the tallest, since it contained the world's highest usable floor. They pointed out that

294-550: Is 102 m (335 ft) tall, and was constructed in the first half of the fourteenth century; and the 97-metre-tall (318 ft) Torre degli Asinelli in Bologna , Italy, built between 1109 and 1119. Timeline of development of world's highest observation deck since inauguration of Eiffel Tower. Higher observation decks have existed on mountain tops or cliffs, rather than on tall structures. The Grand Canyon Skywalk , constructed in 2007, protrudes 21 m (70 ft) over

343-453: Is 634 m (2,080 ft), making it the tallest tower, and third-tallest freestanding structure in the world . The following is a list of structures that have historically held the title as the tallest towers in the world. The list categories are: Notes: Source: Emporis Tallest structures through time Troll A platform The Troll A platform is a Condeep gravity-based structure offshore natural gas platform in

392-471: Is a mathematically joined composite of several conical cylinders that flares out smoothly to greater diameters at the top and bottom, so each support is somewhat wasp-waisted when viewed in profile and circular in any cross-section (see picture at right). The four legs are joined by a "chord shortener" (not present in the picture at right), a reinforced concrete box connecting the legs that damps out any potentially destructive wave-leg resonances by retuning

441-461: Is also the heaviest object moved and the object with the second highest displacement at 1.2 million tons (the object with the highest displacement is the Gullfaks C , which had a displacement approaching 1.5 million tons ). Troll A was towed from the afternoon 10 May 1995 until the platform was in place 17 May 1995. It was lowered to the seabed in 303 meters of water, and had penetrated 36 meters into

490-405: Is defined as the tallest self-supporting artificial structure that stands above ground. This definition is different from that of world's tallest building or world's tallest structure based on the percentage of the structure that is occupied and whether or not it is self-supporting or supported by exterior cables. Likewise, this definition does not count structures that are built underground or on

539-569: Is made up of floor plates containing habitable floor area. 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. The assessment of the height of artificial structures has been controversial. Because varying standards have been used by different organizations,

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588-652: 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 1,306 m (4,285 ft). Shell 's floating production, storage, and offloading oil platform Turritella in the Gulf of Mexico is a moored platform approximately 2,900 m (9,500 ft) tall. Taipei 101 in Taipei, Taiwan, set records in three of

637-668: The CN Tower , the Ostankino Tower and the Oriental Pearl Tower are excluded from these categories because they are not "habitable buildings", which are defined as frame structures made with floors and walls throughout. Freestanding structures must not be supported by guy wires, the sea or other types of support. It therefore does not include guyed masts, partially guyed towers and drilling platforms but does include towers, skyscrapers (pinnacle height) and chimneys. The world's tallest freestanding structure on land

686-777: The Jetavanaramaya stupa in Anuradhapura , Sri Lanka, which was built in the third century, and was similarly tall at 122 m (400 ft). These were both the world's tallest or second-tallest non-pyramidal structure for over a thousand years. The tallest secular building between the collapse of the Pharos and the erection of the Washington Monument may have been the Torre del Mangia in Siena , Italy, which

735-594: The Singer Building , which stood 612 feet (187 meters) tall until the late 1960s where One Liberty Plaza now stands right across Church Street from the WTC site. A different superlative for skyscrapers is their number of floors . The original World Trade Center set that record at 110 in the early 1970s, and this was not surpassed until the Burj Khalifa opened in 2010. Tall freestanding structures such as

784-527: The Troll gas field off the west coast of Norway . Built from reinforced concrete , as of 2014 , it was the tallest structure that has ever been moved to another position, relative to the surface of the Earth, and is among the largest and most complex engineering projects in history. The platform was a televised sensation when it was towed into the North Sea in 1995, where it is now operated by Equinor . It

833-634: The seabed , such as the Petronius Platform in the Gulf of Mexico . Visit world's tallest structure by category for a list of various other definitions. The tallest freestanding structure on land is the Burj Khalifa in Dubai, United Arab Emirates. The building surpassed the height of the previous record holder, the 553.3 m (1,815 ft) CN Tower in Toronto, Ontario, on September 12, 2007. It

882-864: The "totally" tallest was restored in the face of a new threat looming in the Far East—the " Siamese Twins ". A major controversy erupted upon completion of the Petronas Towers in Kuala Lumpur, Malaysia in 1998. These Twin Towers, at 1,483 feet (452 meters), had a higher architectural height (spires, not antennas), but a lower absolute pinnacle height and a lower top occupied floor than the Willis Tower in Chicago. Counting buildings as structures with floors throughout, and with antenna masts excluded,

931-531: The 101-story Taipei 101 in Taipei , Taiwan , was completed, taking the world record for the first three categories. On July 21, 2007, it was announced that Burj Khalifa in Dubai, UAE , had surpassed Taipei 101. Since its completion in early 2010, Burj Khalifa leads in all categories (the first building to do so) with its spire height of 2,722 feet (830 meters). Before Burj Khalifa was completed, Willis Tower led in

980-538: The North Tower) attained a taller absolute height when it added its 360-foot (110 m) new broadcasting antenna, for a total height of 1,728 feet (527 meters). The WTC North Tower maintained this height record (including its antenna) from 1978 until 2000, when the owners of the Willis Tower extended its broadcasting antennae for a total height of 1,729 feet (527 meters). Thus the status of the Willis Tower as

1029-587: The Willis was still considered the tallest at that time. Excluding their spires, which are 9 meters (30 feet) higher than the flat roof of Willis, the Petronas Towers are not taller than Willis. At their convention in Chicago, the Council on Tall Buildings and Urban Habitat (CTBUH) found the Willis Tower (without its antennas) to be the third-tallest building, and the Petronas Towers (with their spires) to be

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1078-416: The absolute height of a building, another includes only spires and other permanent architectural features, but not antennas . The tradition of including the spire on top of a building and not including the antenna dates to the rivalry between the Chrysler Building and 40 Wall Street . A modern-day example is that the antenna on top of Willis Tower is not considered part of its architectural height, while

1127-441: The accepted height of these structures or buildings depends on which standards are accepted. The Council on Tall Buildings and Urban Habitat has changed its definitions over time. Some of the controversy regarding the definitions and assessment of tall structures and buildings has included the following: Within an accepted definition of a building further controversy has included the following factors: This category does not require

1176-575: The autumn of 2010 the Troll A platform was expanded with a new module. This module contains living quarters and a new control room. The new control room and expanded facilities are needed to support new compressors. These compressors are needed due to the dropping reservoir pressure in the wells. On 18 June 2013 the new support module M12 for compressors 3 and 4 was lifted on board Troll A. The increased electricity consumption of these compressors required new power cables from shore, and due to grid constraints

1225-603: The building now famous for the Times Square Ball . Known as One Times Square (at 1475 Broadway in Midtown Manhattan ), it was the headquarters for The New York Times , which gave Times Square its name. Completed in 1905, it reached a height of 364 feet (111 meters) to its roof, or 420 feet (130 meters) including its rooftop flagpole, which the Times hoped would give it a record high status but because

1274-604: The four skyscraper categories at the time it opened in 2004; at the time the Burj Khalifa opened in 2010 it remained the world's tallest inhabited building 509.2 m (1,671 ft) as measured to its architectural height (spire). The height of its roof 449.2 m (1,474 ft) and highest occupied floor 439.2 m (1,441 ft) had been surpassed by the Shanghai World Financial Center with corresponding heights of 487 and 474 m (1,598 and 1,555 ft). Willis Tower (formerly Sears Tower)

1323-474: The height-to-tip category with 1,729 feet (527 meters) after its antenna was extended in 2000, making Willis Tower slightly taller height-to-tip than the World Trade Center (WTC) North Tower's antenna that measured 1,728 feet (527 meters). After the terrorist attacks on September 11, 2001 , the WTC became the world's tallest two buildings to be destroyed or demolished. They took that distinction from

1372-479: The legs' natural frequencies. Each leg is also sub-divided along its length into compartments a third of the way from each end which act as independent water-tight compartments. The legs use groups of six 40 metres (130 ft) tall vacuum-anchors holding them fixed in the mud of the sea floor. Troll A was built by Norwegian Contractors for Norske Shell , with base construction beginning in September 1991 at

1421-422: The level of the lowest, significant, open-air, pedestrian entrance. At the time, the Willis Tower held first place in the second and third categories, the Petronas Towers held the first category, and the original WTC North Tower held the fourth (height to tip) category with its antenna. In 2000, however, a new antenna mast was placed on the Willis Tower, giving it the record in the fourth category. On April 20, 2004,

1470-526: The observation deck of 40 Wall was nearly 100 feet (30 m) higher than the top floor of the Chrysler, whose surpassing spire was strictly ornamental and essentially inaccessible. Despite the protest, the Chrysler Building was generally accepted as the tallest building in the world for almost a year, until it was surpassed by the Empire State Building 's 1,250 feet (380 meters) in 1931. That

1519-508: The platform is cut off from shore power if a grid emergency arises. Gas rises from 40 wells and is exported through a number of pipes to a processing plant at Kollsnes . Troll A is scheduled to receive two additional gas compressors to increase production volume and compensate for dropping reservoir pressure in the wells. In 1996, the platform set the Guinness World Record for the largest offshore gas platform. In 2006,

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1568-419: The same manner as height below ground is ignored on buildings. The Troll A platform is 472 m (1,549 ft), 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 1,000 m (3,300 ft) deep. However, these platforms are not considered constant structures as the vast majority of their height

1617-448: The sea, and the leg containing the import and export risers has an elevator that takes over nine minutes to travel from the platform above the waves to the sea floor. The legs must be able to withstand intense pressures, so the walls of Troll A's legs are over 1 metre thick and are made of steel-reinforced concrete that was formed in one continuous pour  – a lengthy process that takes 20 minutes per 5 cm laid. Each leg

1666-399: The soil by 19 May 1995 . It was self-supporting with no further mooring required . The Troll A platform has an overall height of 472 metres (1,549 ft), weighs 683,600 tons (1.2 million tons with ballast) and has the distinction of being the tallest structure ever moved by mankind. The platform stands on four legs extending down to the sea floor 303 meters (994 feet) below the surface of

1715-713: The spires on top of the Petronas Twin Towers are counted. Note: The following table is a list of the tallest completed structure in each of the structural categories below. For a list of structures by function see the list later in the article. There can only be one structure in each category, unless the tallest is the same for more than one structure in the same category. 2°44′26″N 101°40′45″E  /  2.740486°N 101.679069°E  / 2.740486; 101.679069  ( Kuala Lumpur International Airport 2 Control Tower ) There are some destroyed architectural structures which were taller than

1764-575: The structure to be "officially" open, but does require it to be " topped out ". The tallest artificial structure is Burj Khalifa , a skyscraper in Dubai that reached 829.8 m (2,722 ft) in height on January 17, 2009. By April 8, 2008 it had been built higher than the KVLY-TV mast in North Dakota, US. That September it officially surpassed Poland's 646.38 m (2,120.7 ft) Warsaw radio mast , which stood from 1974 to 1991, to become

1813-433: The tallest existing structure of their type. There are also destroyed structures omitted from this list that had been surpassed in height prior to being destroyed. * "Mixed-use" is defined as having three or more real estate uses (such as retail, office, hotel, etc.) that are physically and functionally integrated in a single property and are mutually supporting. Up until the late 1990s, the definition of "tallest building"

1862-439: The tallest structure ever built. Guyed lattice towers such as these masts had held the world height record since 1954. The Petronius Platform stands 610 m (2,000 ft) off the sea floor, leading some, including Guinness World Records 2007, to claim it as the tallest freestanding structure in the world, until surpassed by the Burj Khalifa in 2010. However, it is debated whether underwater height should be counted, in

1911-522: The third-tallest self-supporting structure and the tallest tower in the world is the Tokyo Skytree (634 m or 2,080 ft). The tallest guyed structure is the KRDK-TV mast in North Dakota, U.S. at 630 metres (2,060 ft). 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 50% of its height

1960-649: The time, to become the second largest public library in the country after the National Library of China . In November 1958, the Shanghai Institute of Scientific and Technical Information was established. In October 1995, Shanghai Library merged with the Shanghai Institute of Scientific and Technical Information to become a research-oriented public library and a comprehensive information research center. 31°12′33″N 121°26′24″E  /  31.20917°N 121.44000°E  / 31.20917; 121.44000 List of tallest buildings and structures in

2009-619: The west rim of the Grand Canyon and is approximately 1,100 m (3,600 ft) above the Colorado River , making it the highest of these types of structures. As most of the tallest structures are guyed masts , here is a timeline of world's tallest guyed masts, since the beginning of radio technology. As many large guyed masts were destroyed at the end of World War II, the dates for the years between 1945 and 1950 may be incorrect. If Wusung Radio Tower survived World War II, it

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2058-506: The world Download coordinates as: The world's tallest human-made structure is the 828-metre-tall (2,717 ft) Burj Khalifa in Dubai , United Arab Emirates. The building gained the official title of " tallest building in the world " and the tallest self-supported structure at its opening on January 9, 2010. The second-tallest structure in the world is the 679-metre-tall (2,227 ft) Merdeka 118 in Kuala Lumpur, Malaysia, while

2107-756: The world's two tallest buildings. Responding to the ensuing controversy, the CTBUH then revised their criteria and defined four categories in which the world's tallest building can be measured, retaining the old criterion of height to architectural top, and adding three new categories: The height-to-roof criterion was discontinued because relatively few modern tall buildings possess flat rooftops, making this criterion difficult to determine and measure. The CTBUH has further clarified their definitions of building height, including specific criteria concerning subbasements and ground level entrances (height measured from lowest, significant, open-air, pedestrian entrance rather than from

2156-425: Was 927 feet (283 meters) tall, had a shorter pinnacle, and had a much higher top occupied floor (the second category in the 1996 criteria for tallest building). In contrast, the Chrysler Building employed a very long 125-foot (38 m) spire secretly assembled inside the building to claim the title of world's tallest building with a total height of 1,048 feet (319 m), despite having a lower top occupied floor and

2205-495: Was completed in 2010, with final height of 829.8 m (2,722 ft). The following is a list of structures that have held the title as the tallest freestanding structure on land. Notable mentions include the Pharos (lighthouse) of Alexandria , built in the third century BC and estimated between 115–135 m (377–443 ft). It was the world's tallest non-pyramidal structure for many centuries. Another notable mention includes

2254-459: Was in turn surpassed by the 1,368-foot-high (417 m) Twin Towers of New York's original World Trade Center in 1972, which were in turn surpassed by the Sears Tower in Chicago in 1974. Now called the Willis Tower since 2009, it was 1,451 feet (442 meters) to its flat rooftop, or 1,518 feet (463 meters) including its original antennas. But in 1978 One World Trade Center (commonly known as

2303-469: Was not altogether clear. It was generally understood to be the height of the building to the top of its architectural elements including spires, but not including "temporary" structures (such as antennas or flagpoles), which could be added or changed relatively easily without requiring major changes to the building's design. Other criteria for height measurement generally were not considered, which occasionally caused some controversy. One historic case involved

2352-417: Was the highest in the final category: the greatest height to top of antenna of any building in the world at 527 m (1,729 ft). Burj Khalifa broke the height record in all four categories for completed buildings. Due to the disagreements over how to measure height and classify structures, engineers have created various definitions for categories of buildings and other structures. One measure includes

2401-790: Was the tallest guyed structure shortly after World War II. Towers include observation towers, monuments and other structures not generally considered to be "habitable buildings", they are meant for "regular access by humans, but not for living in or office work, and are self-supporting or freestanding, which means no guy-wires for support", meaning it excludes from this list of continuously habitable buildings and skyscrapers as well as radio and TV masts . Bridge towers or pylons, chimneys , transmission towers , and most large statues allow human access for maintenance, but not as part of their normal operation, and are therefore not considered to be towers. The Tokyo Skytree , completed in February 2012,

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