Instruct: Given a question, retrieve relevant passages that can help answer the question.
Query: What is the tallest tower in the world?
After Burj Khalifa had been formally recognized by the Guinness World Records as the world's tallest freestanding structure, Guinness re-certified CN Tower as the world's tallest freestanding tower. The tower definition used by Guinness was defined by the Council on Tall Buildings and Urban Habitat as 'a building in which less than 50% of the construction is usable floor space'. "Guinness World Records" editor-in-chief Craig Glenday announced that Burj Khalifa was not classified as a tower because it has too much usable floor space to be considered to be a tower. CN Tower still held world records for highest above ground wine cellar (in 360 Restaurant) at 351 metres, highest above ground restaurant at 346 metres (Horizons Restaurant), and tallest free-standing concrete tower during Guinness's recertification. The CN Tower was surpassed in 2009 by the Canton Tower in Guangzhou, China, which stands at tall, as the world's tallest tower; which in turn was surpassed by the Tokyo Skytree in 2011, which currently is the tallest tower at in height. The CN Tower, as of 2018, stands as the ninth-tallest free-standing structure on land, remains the tallest free-standing structure in the Western Hemisphere, and is the third-tallest tower.
This list of tallest buildings in Toronto ranks skyscrapers in the Canadian city of Toronto, Ontario by height. The tallest structure in Toronto is the CN Tower, which rises . The CN Tower was the tallest free-standing structure on land from 1975 until 2007. However, it is not generally considered a high-rise building as it does not have successive floors that can be occupied. The tallest habitable building in the city is First Canadian Place, which rises 298 metres (978 ft) tall in Toronto's Financial District and was completed in 1975. It also stands as the tallest building in Canada.
Dubai, the largest city in the United Arab Emirates, is home to many modern high-rises, 88 of which stand taller than . The tallest building in Dubai is the Burj Khalifa, which rises and contains 161 floors. The tower has stood as both the tallest building in the world and the tallest man-made structure of any kind in the world since its completion in January 2010. The second-tallest building in Dubai is the Marina 101, which also stands as the world's tallest residential skyscraper. The skyscrapers of Dubai are, for the most part, clustered in three different locations. The land along Sheikh Zayed Road was the first to develop, followed by the Dubai Marina neighborhood and the Business Bay district.
The Hyperion Tower (Korean: 하이페리온 타워), also known as the Mok-dong Hyperion Towers, is a group of three buildings located in the Yangcheon-gu district of Seoul, South Korea, completed in 2003. The tallest of which, Tower A, is 69 storeys and 256 metres (840 feet) high, making it the second tallest building in Seoul and the world's 214th tallest building. The towers are used as residential housing. Tower A is the world's 19th tallest residential building. Below the building is the Hyundai Department store, a chain of high end department stores in South Korea. At the time of its completion, the building was the tallest in the country but was surpassed by Samsung Tower Palace 3 – Tower G in 2004.The Hyperion Tower floors B1~B2 and 1~7 are a department store, while B3~B6 is a parking lot, and floors 9~65 are residential.
Blackpool Tower is a tourist attraction in Blackpool, Lancashire, England, which was opened to the public on 14 May 1894. Inspired by the Eiffel Tower in Paris, it is tall and is the 120th tallest freestanding tower in the world. Blackpool Tower is also the common name for Tower buildings, an entertainment complex in a red-brick three-storey block comprising the tower, the ground floor aquarium and cafeteria, Tower Circus, the Tower Ballroom and roof gardens that was designated a Grade I listed building in 1973.
Ostankino Tower (, "Ostankinskaya telebashnya") is a television and radio tower in Moscow, Russia, owned by the Moscow branch of unitary enterprise Russian TV and Radio Broadcasting Network. Standing , Ostankino was designed by Nikolai Nikitin. It is currently the tallest free-standing structure in Europe and 11th tallest in the world. Between 1967 and 1976 it was the tallest in the world. The tower was the first free-standing structure to exceed in height. Ostankino was built to mark the 50th anniversary of the October Revolution. It is named after the surrounding Ostankino district of Moscow.
The Washington Monument is an obelisk on the National Mall in Washington, D.C., built to commemorate George Washington, once commander-in-chief of the Continental Army and the first President of the United States. Located almost due east of the Reflecting Pool and the Lincoln Memorial, the monument, made of marble, granite, and bluestone gneiss, is both the world's tallest predominantly stone structure and the world's tallest obelisk, standing tall according to the National Geodetic Survey (measured 2013–14) or tall according to the National Park Service (measured 1884). It is the tallest monumental column in the world if all are measured above their pedestrian entrances. It was the tallest structure in the world from 1884 to 1889, when it was overtaken by the Eiffel Tower in Paris.
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.
More than 250 million people have visited the tower since it was completed in 1889. In 2015, there were 6.91 million visitors. The tower is the most-visited paid monument in the world. An average of 25,000 people ascend the tower every day which can result in long queues.
The Chrysler Building is an Art Deco–style skyscraper located on the East Side of Midtown Manhattan in New York City, at the intersection of 42nd Street and Lexington Avenue in the Turtle Bay neighborhood of Manhattan. At , the structure was the world's tallest building for 11 months before it was surpassed by the Empire State Building in 1931. It is the tallest brick building in the world with a steel framework. , the Chrysler is the eighth-tallest building in the city, tied with The New York Times Building.
This list of skyscrapers in Taiwan ranks skyscrapers in Taiwan by height. The tallest building in Taiwan is currently the 101–story Taipei 101, which rises and was completed in 2004. It was officially classified as the world's tallest from 2004 to 2010. Now, it is still the tallest building in Taiwan, Asia's 6th tallest building and the world's 9th tallest building. There are currently six buildings over 200m under construction in Taiwan, including the Taipei Twin Tower 1, which is under planning and will reach and the Taipei Sky Tower, which is under construction in Taipei and will reach .
Museum Tower is the 15th-tallest structure in Dallas, tied with both the Reunion Tower and Cityplace Center in height. Among all-residential buildings in Dallas it is surpassed in height only by the Republic Center Tower I, with its spire. However, if measuring by roof height, and thereby excluding the Republic Center Tower I's spire, Museum Tower is taller. It also breaks the record for the highest residence in Dallas, surpassing the Republic I. The Museum Tower is the 4th-tallest building in Dallas' Arts District, behind Chase Tower, Fountain Place, and the Trammell Crow Center; with Bank Of America Plaza being the tallest building in Dallas.
The Torre Mayor (literally "Major Tower") is a skyscraper in Mexico City, Mexico. With a height of 225 metres (738 feet) to the top floor and 55 stories, it is the third tallest building in Mexico. It was surpassed in height by Torre BBVA Bancomer in 2015, which in turn was surpassed by Torre Reforma. From its completion in 2003 until 2010 (when it was surpassed by the 236 meter (774 ft) high Ocean Two in Panama City. ) it was also the tallest building in Latin America. The Torre Mayor was developed by Canadian businessman Paul Reichmann, who also maintains part ownership. It is also part-owned by a group of institutional investors. The building was designed by the architectural firms of Zeidler Partnership Architects and Executive Architects Adamson Associates Architects, both of Toronto. The structural engineers and designers were The Cantor Seinuk Group from New York City in association with Enrique Martínez Romero S.A. in Mexico City (Engineering News-Record, June 30, 2003).
On September 11, 2001, two of four hijacked planes were flown into the Twin Towers of the original World Trade Center, and the towers subsequently collapsed. 7 World Trade Center collapsed due to fires and structural damage caused by heavy debris falling from the collapse of the Twin Towers. The other buildings within the World Trade Center complex were damaged beyond repair and soon after demolished. The collapse of the Twin Towers caused extensive damage to other surrounding buildings and skyscrapers in Lower Manhattan, and resulted in the deaths of 2,606 people, in addition to those on the planes. Since 2001, most of Lower Manhattan has been restored, although there has been controversy surrounding the rebuilding. Many rescue workers and residents of the area developed several life-threatening illnesses that have led to some of their subsequent deaths. A memorial at the site was opened to the public on September 11, 2011, and the museum opened in 2014. In 2014, the new One World Trade Center, at and formerly known as the Freedom Tower, became the tallest building in the Western Hemisphere, while other skyscrapers were under construction at the site.
The highest mountains above sea level are generally not the highest above the surrounding terrain. There is no precise definition of surrounding base, but Denali, Mount Kilimanjaro and Nanga Parbat are possible candidates for the tallest mountain on land by this measure. The bases of mountain islands are below sea level, and given this consideration Mauna Kea ( above sea level) is the world's tallest mountain and volcano, rising about from the Pacific Ocean floor. Ojos del Salado has the greatest rise on Earth— from the summit to the bottom of the Atacama Trench about away, though most of this rise is not part of the mountain.
Heights of mountains are typically measured above sea level. Using this metric, Mount Everest is the highest mountain on Earth, at . There are at least 100 mountains with heights of over above sea level, all of which are located in central and southern Asia. The highest mountains above sea level are generally not the highest above the surrounding terrain. There is no precise definition of surrounding base, but Denali, Mount Kilimanjaro and Nanga Parbat are possible candidates for the tallest mountain on land by this measure. The bases of mountain islands are below sea level, and given this consideration Mauna Kea ( above sea level) is the world's tallest mountain and volcano, rising about from the Pacific Ocean floor.
Thanksgiving Tower is a 50-story, skyscraper at 1601 Elm Street in adjacent to Thanks-Giving Square downtown Dallas Texas. At its completion in 1982, it was the second tallest building in Dallas, surpassing Elm Place. One year later, with the completion 1700 Pacific it became the third tallest, and it is currently the 8th-tallest building in the city. The building is connected to the Dallas Pedestrian Network and the Bullington Truck Terminal. Thanksgiving Tower is owned and managed by Woods Capital, and it was designed by the architecture firm HKS Architects.
The height of the tower is from the ground on the low side and on the high side. The width of the walls at the base is . Its weight is estimated at . The tower has 296 or 294 steps; the seventh floor has two fewer steps on the north-facing staircase. In 1990 the tower leaned at an angle of 5.5 degrees, but following remedial work between 1993 and 2001 this was reduced to 3.97 degrees, reducing the overhang by 45 cm at a cost of £200m. It lost a further 4 cm of tilt in the two decades to 2018.
Constructed from 1887–1889 as the entrance to the 1889 World's Fair, it was initially criticised by some of France's leading artists and intellectuals for its design, but it has become a global cultural icon of France and one of the most recognisable structures in the world. The Eiffel Tower is the most-visited paid monument in the world; 6.91 million people ascended it in 2015.
Dallas, the third largest city in the U.S. state of Texas, is the site of 36 completed high-rises over , 19 of which stand taller than . The tallest building in the city is the Bank of America Plaza, which rises in Downtown Dallas and was completed in 1985. It also stands as the 3rd-tallest building in Texas and the 28th-tallest building in the United States. The second-tallest skyscraper in the city is the Renaissance Tower, which rises and was completed in 1974. The Comerica Bank Tower, completed in 1987 and rising , is the third-tallest building in Dallas. Three of the ten tallest buildings in Texas are located in Dallas.
The south tower, TELUShouse (formerly TELUS Plaza South, and originally the AGT Tower), was completed in 1971, at a cost of C$22 million. It was Edmonton's tallest building until Manulife Place was completed in 1981. It is 134.4 metres (34 storeys) tall. For many years the 33rd floor was home to Vista 33, a telephone and telecommunications museum. There was also an observation deck which afforded panoramic views of Edmonton from what was then the city's tallest building. Vista 33 was closed in 1993.
"Guinness World Records" has called the CN Tower "the world's tallest self-supporting tower" and "the world's tallest free-standing tower". Although Guinness did list this description of the CN Tower under the heading "tallest building" at least once, it has also listed it under "tallest tower", omitting it from its list of "tallest buildings." In 1996, Guinness changed the tower's classification to "World's Tallest Building and Freestanding Structure". Emporis and the Council on Tall Buildings and Urban Habitat both listed the CN Tower as the world's tallest free-standing structure on land, and specifically state that the CN Tower is not a true building, thereby awarding the title of world's tallest building to Taipei 101, which is shorter than the CN Tower. The issue of what was tallest became moot when Burj Khalifa, then under construction, exceeded the height of the CN Tower in 2007 (see below).
The CN Tower held the record for the world's tallest free-standing structure for 32 years until 2007 and was the world's tallest tower until 2009 when it was overtaken by Burj Khalifa and Canton Tower, respectively. It is now the ninth tallest free-standing structure in the world and remains the tallest free-standing structure in the Western Hemisphere. 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.
At , the Glasgow Tower is currently the tallest tower in Scotland, and since late 2015 following the demolition of both the Red Road Flats and the Bluevale and Whitevale Towers the structure is now the tallest in all of Glasgow. It holds a Guinness World Record for being the tallest tower in the world in which the whole structure is capable of rotating 360 degrees. The whole structure originally rested upon a Nigerian made thrust bearing, but this was replaced with a phosphor-manganese-bronze alloy solid ball and cup bearing prior to re-opening in 2014. This bearing rests at the bottom of a caisson, while the tower itself is not directly connected to these foundations, instead being supported by a ring of 24 rubber-sprung roller bearings at Podium level. This is to allow the building to rotate to face into the wind.
The tallest freestanding clock tower in the world is the Joseph Chamberlain Memorial Clock Tower (Old Joe) at the University of Birmingham in Birmingham, United Kingdom. The tower stands at tall and was completed in 1908. The clock tower of Philadelphia City Hall was part of the tallest building in the world from 1894, when the tower was topped out and the building partially occupied, until 1908.