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55-495: Tokyo Skytree ( 東京スカイツリー , Tōkyō Sukaitsurī , [toːkʲoː sɯ̥kaitsɯriː] ) , also written as Tokyo Sky Tree , is a broadcasting and observation tower , located in Sumida , Tokyo , Japan . It is the tallest tower in Japan since opening in 2012, and reached its full height of 634 meters (2,080 ft) in early 2011, making it the tallest tower in the world, displacing

110-457: A daimyō or had a significant samurai population. Kyoto's character was defined by the Imperial Court, the court nobles , its Buddhist temples and its history; Osaka was the country's commercial center, dominated by the chōnin or the merchant class. On the contrary, the samurai and daimyō residences occupied up to 70% of the area of Edo. On the east and northeast sides of the castle lived

165-450: A capacity of up to 2,000 people, and 450 m (1,480 ft), with a capacity of 900 people. The upper observatory features a spiral, glass-covered skywalk in which visitors ascend the last 5 metres to the highest point at the upper platform. A section of glass flooring gives visitors a direct downward view of the streets below. The tower has seismic proofing , including a central shaft made of reinforced concrete. The main internal pillar

220-484: A certain height, a tower can be made with the supporting structure with parallel sides. However, above a certain height, the compressive load of the material is exceeded, and the tower will fail. This can be avoided if the tower's support structure tapers up the building. A second limit is that of buckling—the structure requires sufficient stiffness to avoid breaking under the loads it faces, especially those due to winds. Many very tall towers have their support structures at

275-456: A crowd of tens of thousands, despite rainy conditions which blocked the view from the tower's observation deck . Strong winds also forced two elevators to be shut down, leaving some visitors briefly stranded on the observation deck. According to Tobu, 1.6 million people visited Skytree in its first week. Local residents reported that the influx of visitors disturbed the peace of their community and had, so far, generated little economic benefit for

330-511: A feature on top of a larger structure or building. Old English torr is from Latin turris via Old French tor . The Latin term together with Greek τύρσις was loaned from a pre-Indo-European Mediterranean language, connected with the Illyrian toponym Βου-δοργίς. With the Lydian toponyms Τύρρα, Τύρσα, it has been connected with the ethnonym Τυρρήνιοι as well as with Tusci (from *Turs-ci ),

385-474: A hiding residence if needed. The lower residence ( 下屋敷 , shimo-yashiki ) , if there was any, was on the outskirts of town, more of a pleasure retreat with gardens. The lower residence could also be used as a retreat for the lord if a fire had devastated the city. Some of the powerful daimyōs residences occupied vast grounds of several dozens of hectares. Maintenance and operations of those residential estates could be extremely expensive. Samurai in service of

440-769: A specific clan would normally live in the residence of their lord. The hatamoto samurais, in direct service of the Shogun, would have their own residences, usually located behind the castle on the Western side in the Banchō area. In a strict sense of the word, chōnin were only the townspeople who owned their residence, which was actually a minority. The shonin population mainly lived in semi-collective housings called nagaya ( 長屋 , litt. "Long house") , multi-rooms wooden dwellings, organized in enclosed machi ( 町 , "town" or "village") , with communal facilities, such as wells connected to

495-711: A target (see siege tower ). Today, strategic-use towers are still used at prisons, military camps, and defensive perimeters. By using gravity to move objects or substances downward, a tower can be used to store items or liquids like a storage silo or a water tower , or aim an object into the earth such as a drilling tower . Ski-jump ramps use the same idea, and in the absence of a natural mountain slope or hill, can be human-made. In history, simple towers like lighthouses , bell towers , clock towers , signal towers and minarets were used to communicate information over greater distances. In more recent years, radio masts and cell phone towers facilitate communication by expanding

550-521: Is also sometimes used to refer to firefighting equipment with an extremely tall ladder designed for use in firefighting/rescue operations involving high-rise buildings. Edo Edo ( Japanese : 江戸 , lit.   '"bay-entrance" or " estuary "'), also romanized as Jedo , Yedo or Yeddo , is the former name of Tokyo . Edo, formerly a jōkamachi (castle town) centered on Edo Castle located in Musashi Province , became

605-426: Is attached to the outer tower structure for the first 125 metres above ground. From there until 375 metres the pillar is attached to the tower frame with oil dampers, which act as cushions during an earthquake. Additional resilience is achieved through an "added mass control mechanism" (or tuned mass damper ) – a damping system which, in the event of an earthquake, moves out of step with the building's structure, to keep

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660-460: Is in the Tokyo Solamachi complex. The tower's design was published on 24 November 2006, based on the following three concepts: The base of the tower has a structure similar to a tripod ; from a height of about 350 m (1,150 ft) and above, the tower's structure is cylindrical to offer panoramic views of the river and the city. There are observatories at 350 m (1,150 ft), with

715-601: Is known as the Edo period . Before the 10th century, there is no mention of Edo in historical records, but for a few settlements in the area. That name for the area first appears in the Azuma Kagami chronicles, which have probably been used since the second half of the Heian period . Edo's development started in the late 11th century with a branch of the Kanmu- Taira clan ( 桓武平氏 ) called

770-528: Is the sky blue Iki (chic, stylish), and the other is the purple Miyabi (elegance, refinement). The tower is illuminated using LEDs . From October to November 2007, suggestions were collected from the general public for the name to be given to the tower. On 19 March 2008, a committee chose six final candidate names: Tōkyō Sukaitsurī ( 東京スカイツリー , "Tokyo sky tree") , Tōkyō Edo Tawā ( 東京EDOタワー , "Tokyo Edo tower") , Raijingu Tawā ( ライジングタワー , "Rising tower") , Mirai Tawā ( みらいタワー , "Tower of

825-667: The de facto capital of Japan from 1603 as the seat of the Tokugawa shogunate . Edo grew to become one of the largest cities in the world under the Tokugawa. After the Meiji Restoration in 1868 the Meiji government renamed Edo as Tokyo ( 東 京 , "Eastern Capital") and relocated the Emperor from the historic capital of Kyoto to the city. The era of Tokugawa rule in Japan from 1603 to 1868

880-461: The sankin-kōtai system; the daimyō made journeys in alternating years to Edo and used the residences for their entourages. The location of each residence was carefully attributed depending on their position as tozama , shinpan or fudai . It was this extensive organization of the city for the samurai class which defined the character of Edo, particularly in contrast to the two major cities of Kyoto and Osaka , neither of which were ruled by

935-521: The Canton Tower , and the third tallest structure in the world (behind Merdeka 118 (678.9 m or 2,227 ft) and Burj Khalifa (829.8 m or 2,722 ft)). The tower is the primary television and radio broadcast site for the Kantō region ; the older Tokyo Tower no longer gives complete digital terrestrial television broadcasting coverage because it is surrounded by high-rise buildings. Skytree

990-777: The Qin dynasty . Towers were also an important element of castles . Other well known towers include the Leaning Tower of Pisa in Pisa, Italy built from 1173 until 1372, the Two Towers in Bologna, Italy built from 1109 until 1119 and the Towers of Pavia (25 survive), built between 11th and 13th century. The Himalayan Towers are stone towers located chiefly in Tibet built approximately 14th to 15th century. Up to

1045-469: The Shomin ( 庶民 , "regular people") including the chōnin in a much more densely populated area than the samurai class area, organized in a series of gated communities called machi (町, "town" or "village"). This area, Shitamachi (下町, "lower town" or "lower towns"), was the center of urban and merchant culture. Shomin also lived along the main roads leading in and out of the city. The Sumida River, then called

1100-487: The machi , where single floor nagayas , the uranagayas ( 裏長屋 , litt. "backstreet long houses") were located. Rentals and smaller rooms for lower ranked shonin were located in those back housings. Edo was nicknamed the City of 808 towns ( 江戸八百八町 , Edo happyaku yachō ) , depicting the large number and diversity of those communities, but the actual number was closer to 1,700 by the 18th century. Edo's municipal government

1155-536: The 3rd millennium BC, and the Etemenanki , one of the most famous examples of Babylonian architecture . Some of the earliest surviving examples are the broch structures in northern Scotland , which are conical tower houses . These and other examples from Phoenician and Roman cultures emphasised the use of a tower in fortification and sentinel roles. For example, the name of the Moroccan city of Mogador , founded in

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1210-637: The Chichibu clan ( 秩父氏 ) coming from the banks of the then- Iruma River , present-day upstream of the Arakawa river. A descendant of the head of the Chichibu clan settled in the area and took the name Edo Shigetsugu ( 江戸重継 ) , likely based on the name used for the place, and founded the Edo clan . Shigetsugu built a fortified residence, probably around the edge of the Musashino Terrace , that would become Edo castle. Shigetsugu's son, Edo Shigenaga ( 江戸重長 ) , took

1265-593: The Great River (大川, Ōkawa ), ran on the eastern side of the city. The shogunate's official rice-storage warehouses and other official buildings were located here. The Nihonbashi bridge ( 日本橋 , lit. "bridge of Japan") marked the center of the city's commercial center and the starting point of the gokaidō (thus making it the de facto "center of the country"). Fishermen, craftsmen and other producers and retailers operated here. Shippers managed ships known as tarubune to and from Osaka and other cities, bringing goods into

1320-629: The Greek and Latin names for the Etruscans (Kretschmer Glotta 22, 110ff.) Towers have been used by humankind since prehistoric times. The oldest known may be the circular stone tower in walls of Neolithic Jericho (8000 BC). Some of the earliest towers were ziggurats , which existed in Sumerian architecture since the 4th millennium BC. The most famous ziggurats include the Sumerian Ziggurat of Ur , built in

1375-571: The Kanda river), to limit the risks of flooding. Landfill works on the bay began, with several areas reclaimed during the duration of the shogunate (notably the Tsukiji area). East of the city and of the Sumida River , a massive network of canals was dug. Fresh water was a major issue, as direct wells would provide brackish water because of the location of the city over an estuary. The few fresh water ponds of

1430-792: The Kantō area. When the Hōjō clan was finally defeated by Toyotomi Hideyoshi in 1590, the Kanto area was given to rule to Toyotomi's senior officer Tokugawa Ieyasu , who took his residence in Edo. Tokugawa Ieyasu emerged as the paramount warlord of the Sengoku period following his victory at the Battle of Sekigahara in October 1600. He formally founded the Tokugawa shogunate in 1603 and established his headquarters at Edo Castle . Edo became

1485-508: The Sumida riverbank leading along the northern edge of the city to the Yoshiwara pleasure district. Previously located near Ningyōchō, the district was rebuilt in this more remote location after the great fire of Meireki. Danzaemon, the hereditary position head of eta , or outcasts, who performed "unclean" works in the city resided nearby. Temples and shrines occupied roughly 15% of the surface of

1540-655: The Taira's side against Minamoto no Yoritomo in 1180 but eventually surrendered to Minamoto and became a gokenin for the Kamakura shogunate . At the fall of the shogunate in the 14th century, the Edo clan took the side of the Southern Court , and its influence declined during the Muromachi period . In 1456, a vassal of the Ōgigayatsu branch of the Uesugi clan started to build a castle on

1595-458: The Tokugawa shogunate was overthrown in the Meiji Restoration by supporters of Emperor Meiji and his Imperial Court in Kyoto , ending Edo's status as the de facto capital of Japan. However, the new Meiji government soon renamed Edo to Tōkyō (東京, "Eastern Capital") and the city became the formal capital of Japan when the emperor moved his residence to the city. Very quickly after its inception,

1650-463: The center of political power and the de facto capital of Japan, although the historic capital of Kyoto remained the de jure capital as the seat of the emperor. Edo grew from a fishing village in Musashi Province in 1457 into the largest metropolis in the world, with an estimated population of 1 million by 1721. Edo was repeatedly devastated by fires, the Great Fire of Meireki in 1657 being

1705-456: The centre of gravity as central as possible to the tower's base. According to the designers, the dampers can absorb 50 percent of the energy from an earthquake. The exterior lattice is painted a colour officially called "Skytree White". This is an original colour based on a bluish-white traditional Japanese colour called aijiro ( 藍白 ) . The illumination design was published on 16 October 2009. Two illumination patterns alternate daily. One

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1760-653: The city east of the Sumida River, and some daimyō residences were relocated to give more space to the city, especially in the immediate vicinity of the shogun's residence, creating a large green space beside the castle, now the Fukiage gardens of the Imperial Palace . During the Edo period, there were about 100 major fires, mostly begun by accident and often quickly escalating and spreading through neighborhoods of wooden nagaya that were heated with charcoal fires. In 1868,

1815-404: The city or transferring them from sea routes to river barges or land routes. The northeastern corner of the city was considered dangerous in the traditional onmyōdō cosmology and was protected from evil by a number of temples including Sensō-ji and Kan'ei-ji , one of the two tutelary Bodaiji temples of the Tokugawa. A path and a canal, a short distance north of Sensō-ji, extended west from

1870-583: The city were put to use, and a network of canals and underground wooden pipes bringing freshwater from the western side of the city and the Tama River was built. Some of this infrastructure was used until the 20th century. The city was laid out as a castle town around Edo Castle, which was positioned at the tip of the Musashino terrace . The area in the immediate proximity of the castle consisted of samurai and daimyō residences, whose families lived in Edo as part of

1925-403: The city's fresh water distribution system, garbage collection area and communal bathrooms. A typical machi was of rectangular shape and could have a population of several hundred. The machi had curfew for the night with closing and guarded gates called kidomon ( 木戸門 ) opening on the main street ( 表通り , omote-dori ) in the machi . Two floor buildings and larger shops, reserved to

1980-546: The city, equivalent to the living areas of the townspeople, with however an average of one-tenth of its population. Temples and shrines were spread out over the city. Besides the large concentration in the northeast side to protect the city, the second Bodaiji of the Tokugawa, Zōjō-ji occupied a large area south of the castle. The samurai and daimyōs residential estates varied dramatically in size depending on their status. Some daimyōs could have several of those residences in Edo. The upper residence ( 上屋敷 , kami-yashiki ) ,

2035-572: The cove, and on Edomaeto ( 江戸前島 ) , the stretch of land on the eastern side of the cove (now roughly where Tokyo Station is). Some priests and scholars fleeing Kyoto after the Ōnin War came to Edo during that period. After the death of Dōkan, the castle became one of strongholds of the Uesugi clan, which fell to the Later Hōjō clan at the battle of Takanawahara in 1524, during the expansion of their rule over

2090-520: The entire building simultaneously. Although not correctly defined as towers, many modern high-rise buildings (in particular skyscraper ) have 'tower' in their name or are colloquially called 'towers'. Skyscrapers are more properly classified as 'buildings'. In the United Kingdom , tall domestic buildings are referred to as tower blocks . In the United States , the original World Trade Center had

2145-689: The first millennium BC, is derived from the Phoenician word for watchtower ('migdol'). The Romans utilised octagonal towers as elements of Diocletian's Palace in Croatia , which monument dates to approximately 300 AD, while the Servian Walls (4th century BC) and the Aurelian Walls (3rd century AD) featured square ones. The Chinese used towers as integrated elements of the Great Wall of China in 210 BC during

2200-471: The former fortified residence of the Edo clan and took the name Ōta Dōkan . Dōkan lived in the castle until his assassination in 1486. Under Dōkan, with good water connections to Kamakura, Odawara and other parts of Kanto and the country, Edo expanded as a jōkamachi , with the castle bordering a cove (now Hibiya Park ) opening into Edo Bay , and the town developing along the Hirakawa River running into

2255-405: The future") , Yumemi Yagura ( ゆめみやぐら , "Dream lookout") , Raijingu Īsuto Tawā ( ライジングイーストタワー , "Rising east tower") . The official name was decided in a nationwide vote, and was announced on 10 June 2008 as "Tokyo Skytree". The name received around 33,000 votes (30%) out of 110,000 cast, with the second most popular name being "Tokyo Edo Tower". The height of 634 m (2,080 ft)

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2310-433: The higher-ranking members of the society, were facing the main street. A machi would typically follow a grid pattern and smaller streets, Shinmichi ( 新道 ) , were opening on the main street, also with (sometimes) two-floor buildings, shop on the first floor, living quarter on the second floor, for the more well-off residents. Very narrow streets accessible through small gates called roji ( 路地 ) , would enter deeper inside

2365-586: The local area. Sources Tower Towers are specifically distinguished from buildings in that they are built not to be habitable but to serve other functions using the height of the tower. For example, the height of a clock tower improves the visibility of the clock, and the height of a tower in a fortified building such as a castle increases the visibility of the surroundings for defensive purposes. Towers may also be built for observation , leisure, or telecommunication purposes. A tower can stand alone or be supported by adjacent buildings, or it may be

2420-445: The most disastrous, with an estimated 100,000 victims and a vast portion of the city completely burnt. The population of Edo was around 300,000, and the impact of the fire was tremendous. The fire destroyed the central keep of Edo Castle, which was never rebuilt, and it influenced the urban planning afterwards to make the city more resilient, with many empty areas to break spreading fires, and wider streets. Reconstruction efforts expanded

2475-622: The nickname the Twin Towers, a name shared with the Petronas Twin Towers in Kuala Lumpur . In addition some of the structures listed below do not follow the strict criteria used at List of tallest towers . The tower throughout history has provided its users with an advantage in surveying defensive positions and obtaining a better view of the surrounding areas, including battlefields. They were constructed on defensive walls , or rolled near

2530-456: The periphery of the building, which greatly increases the overall stiffness. A third limit is dynamic; a tower is subject to varying winds, vortex shedding, seismic disturbances etc. These are often dealt with through a combination of simple strength and stiffness, as well as in some cases tuned mass dampers to damp out movements. Varying or tapering the outer aspect of the tower with height avoids vibrations due to vortex shedding occurring along

2585-650: The range of the transmitter. The CN Tower in Toronto, Ontario , Canada was built as a communications tower, with the capability to act as both a transmitter and repeater. Towers can also be used to support bridges, and can reach heights that rival some of the tallest buildings above-water. Their use is most prevalent in suspension bridges and cable-stayed bridges . The use of the pylon, a simple tower structure, has also helped to build railroad bridges, mass-transit systems, and harbors. Control towers are used to give visibility to help direct aviation traffic. The term "tower"

2640-478: The same geographical jurisdiction in spite of their name but rotated roles on a monthly basis. Despite their extensive responsibilities, the teams of the Machi-Bugyō were rather small, with 2 offices of 125 people each. The Machi-Bugyō did not have jurisdiction over the samurai residential areas, which remained under the shogunate direct rule. The geographical jurisdiction of the Machi-Bugyō did not exactly coincide with

2695-515: The shogunate undertook major works in Edo that drastically changed the topography of the area, notably under the Tenka-Bushin ( 天下普請 ) nationwide program of major civil works involving the now pacified daimyō workforce. The Hibiya cove facing the castle was soon filled after the arrival of Ieyasu, the Hirakawa river was diverted, and several protective moats and logistical canals were dug (including

2750-404: The upper residence, which could also act as a refuge. The estate of the upper residence was attributed by the shogunate according to the status of the clan and its relation with the Shogun. The middle residence ( 中屋敷 , naka-yashiki ) , a bit further from the castle, could house the heir of the lord, his servants from his fief when he was in Edo for the sankin-kotai alternate residency, or be

2805-520: The very beginning of the shogunate daimyōs , later hatamoto ) officials appointed to keep the order in the city, with the word designating both the heading magistrate, the magistrature and its organization. They were in charge of Edo's day-to-day administration, combining the role of police, judge and fire brigade. There were two offices, the South Machi-Bugyō and the North Machi-Bugyō, which had

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2860-444: Was completed on Leap Day, 29 February 2012, with the tower opening to the public on 22 May 2012. The tower is the centrepiece of a large commercial development funded by Tobu Railway (which owns the complex) and a group of six terrestrial broadcasters headed by NHK . Trains stop at the adjacent Tokyo Skytree Station and nearby Oshiage Station . The complex is seven kilometres (4.3 miles) northeast of Tokyo Station . Sumida Aquarium

2915-555: Was selected to be easily remembered. The figures 6 (mu), 3 (sa), 4 (shi) stand for " Musashi ", an old name for the region where the Tokyo Skytree stands. Tokyo Skytree is used as a radio/television broadcast and communications tower. As the Skytree's opening approached, people reportedly waited in line for a week to get tickets. By the opening, trips up the tower were fully booked for the first two months of operation. The opening day drew

2970-414: Was the main residence while the lord was in Edo and was used for official duties. It was not necessarily the largest of his residences, but the most convenient to commute to the castle. The upper residence also acted as the representative embassy of the domain in Edo, connecting the shogunate and the clan. The shogunate did not exercise its investigative powers inside the precincts of the residential estate of

3025-530: Was under the responsibility of the rōjū , the senior officials who oversaw the entire bakufu – the government of the Tokugawa shogunate. The administrative definition of Edo was called Gofunai ( 御府内 , litt. "where the government is") . The Kanjō-bugyō (finance commissioners) were responsible for the financial matters of the shogunate, whereas the Jisha-Bugyō handled matters related to shrines and temples. The Machi-bugyō ( 町奉行 ) were samurai (at

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