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One World Trade Center, also known as One World Trade, One WTC, and formerly called the Freedom Tower during initial planning stages, is the main building of the rebuilt World Trade Center complex in Lower Manhattan, New York City.Designed by David Childs of Skidmore, Owings & Merrill, One World Trade Center is the tallest building in the United States, the tallest building in the Western ...
Archived from the original on April 5, 2015. [5] [10] [11] The Empire State Building is a 102-story [c] Art Deco skyscraper in the Midtown South neighborhood of Manhattan in New York City. The building was designed by Shreve, Lamb & Harmon and built from 1930 to 1931. Its name is derived from "Empire State", the nickname of the state of New York.
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The collection of fortifications known as the Great Wall of China has historically had a number of different names in both Chinese and English. In Chinese histories, the term "Long Wall(s)" (t 長城, s 长城, Chángchéng) appears in Sima Qian's Records of the Grand Historian, where it referred both to the separate great walls built between and north of th...
Early walls
The Chinese were already familiar with the techniques of wall-building by the time of the Spring and Autumn period between the 8th and 5th centuries BC. During this time and the subsequent Warring States period, the states of Qin, Wei, Zhao, Qi, Han, Yan, and Zhongshanall constructed extensive fortifications to defend their own borders. Built to withstand the attack of small arms such as swords and spears, these walls were made mostly of stone or by stamping earth and gravel between board fra...
Ming era
The Great Wall concept was revived again under the Ming in the 14th century, and following the Ming army's defeat by the Oirats in the Battle of Tumu. The Ming had failed to gain a clear upper hand over the Mongol tribes after successive battles, and the long-drawn conflict was taking a toll on the empire. The Ming adopted a new strategy to keep the nomadic tribes out by constructing walls along the northern border of China. Acknowledging the Mongol control established in the Ordos Desert, th...
Foreign accounts
None of the Europeans who visited China or Mongolia in the 13th and 14th centuries, such as Giovanni da Pian del Carpine, William of Rubruck, Marco Polo, Odoric of Pordenone and Giovanni de' Marignolli, mentioned the Great Wall. The North African traveler Ibn Battuta, who also visited China during the Yuan dynasty c.1346, had heard about China's Great Wall, possibly before he had arrived in China. He wrote that the wall is "sixty days' travel" from Zeitun (modern Quanzhou) in his travelogue G...
A formal definition of what constitutes a "Great Wall" has not been agreed upon, making the full course of the Great Wall difficult to describe in its entirety.The defensive lines contain multiple stretches of ramparts, trenches and ditches, as well as individual fortresses. In 2012, based on existing research and the results of a comprehensive map...
Before the use of bricks, the Great Wall was mainly built from rammed earth, stones, and wood. During the Ming, however, bricks were heavily used in many areas of the wall, as were materials such as tiles, lime, and stone. The size and weight of the bricks made them easier to work with than earth and stone, so construction quickened. Additionally, ...
While portions north of Beijing and near tourist centers have been preserved and even extensively renovated, in many other locations the wall is in disrepair. The wall sometimes provided a source of stones to build houses and roads. Sections of the wall are also prone to graffiti and vandalism, while inscribed bricks were pilfered and sold on the m...
Various factoidsin popular culture claim that the Great Wall can be seen (with the naked eye) from space, with questionable degrees of veracity.
The Great Wall at BadalingThe Great Wall at dawnThe Juyongguan area of the Great Wall accepts numerous tourists each day.Remains of Beacon tower, near Yumenguan, 2011International Friends of the Great Wall Archived February 17, 2009, at the Wayback Machine– organization focused on conservationGreat Wall of China on In Our Time at the BBCSizes are not to scale. A geomagnetic storm, also known as a magnetic storm, is a temporary disturbance of the Earth 's magnetosphere caused by a solar wind shock wave. The disturbance that drives the magnetic storm may be a solar coronal mass ejection (CME) or (much less severely) a co-rotating interaction region (CIR), a high-speed stream of ...
Magnetic resonance imaging (MRI) is a medical imaging technique used in radiology to form pictures of the anatomy and the physiological processes inside the body. MRI scanners use strong magnetic fields, magnetic field gradients, and radio waves to generate images of the organs in the body. MRI does not involve X-rays or the use of ionizing ...
The Forbidden City ( Chinese: 紫禁城; pinyin: Zǐjìnchéng) is a palace complex in Dongcheng District, Beijing, China, at the center of the Imperial City of Beijing. It is surrounded by numerous opulent imperial gardens and temples including the 22 ha (54-acre) Zhongshan Park, the sacrificial Imperial Ancestral Temple, the 69 ha (171-acre ...
Antoni Gaudí i Cornet [3] ( / ɡaʊˈdi / gow-DEE, / ˈɡaʊdi / GOW-dee, Catalan: [ənˈtɔni ɣəwˈði]; [4] 25 June 1852 – 10 June 1926) was a Catalan architect and designer from Spain, known as the greatest exponent of Catalan Modernism. [5] Gaudí's works have a highly individualized, sui generis style. Most are located in Barcelona ...
