The Burj Khalifa (Arabic: ??? ?????, Arabic pronunciation: [b?rd?? xa?li?fa]; pronounced English: ), known as the Burj Dubai prior to its inauguration in 2010, is a skyscraper in Dubai, United Arab Emirates. With a total height of 829.8 m (2,722 feet, just over half a mile) and a roof height (excluding antenna, but such as a 244 m spire) of 828 m (2,717 feet ), the Burj Khalifa has been the tallest structure and building in the world since its topping out in 2009 (preceded by Taipei 101).Construction of the Burj Khalifa began in 2004, with the exterior finished five decades later in 2009. The principal structure is reinforced concrete. The building was opened in 2010 as part of a new development called Downtown Dubai. It is designed to be the centrepiece of large-scale, mixed-use development. The decision to construct the building relies on the government's decision to diversify from an oil-based economy, and for Dubai to obtain international recognition. The building was originally named Burj Dubai but was renamed in honour of the ruler of Abu Dhabi and president of the United Arab Emirates, Khalifa bin Zayed Al Nahyan; Abu Dhabi and the UAE government lent Dubai money to pay its debts. The building broke numerous height records, including its designation as the tallest building in the world.
Burj Khalifa was designed by Adrian Smith, of Skidmore, Owings & Merrill, whose firm designed the Willis Tower and One World Trade Center. Hyder Consulting was selected to be the supervising engineer with NORR Group Consultants International Limited selected to supervise the architecture of this project. The design is derived from the Islamic architecture of the region, such as in the Great Mosque of Samarra.
<p>Cologne Cathedral (German: Kölner Dom, Formally Hohe Domkirche Sankt Petrus, English: Cathedral Church of Saint Peter) is a Catholic cathedral in Cologne, North Rhine-Westphalia, Germany. </p>It is the seat of the Archbishop of Cologne and of the government of the Archdiocese of Cologne. It is a monument of architecture and German Catholicism and was declared a World Heritage Site in 1996. It is Germany's most visited landmark, bringing an average of 20,000 people every day. In 157 m (515 ft), the cathedral is now the tallest twin-spired church on earth, the 2nd largest church in Europe after Ulm Minster, and the third largest church in the world. It contains the second-tallest spires and is the largest Gothic church in Northern Europe. The cathedral is given the of any church in the world by the towers for both spires that are huge. The choir has the largest height to width ratio, 3.6:1, of any medieval church.Construction of Cologne Cathedral started in 1248 but was stopped in 1473, unfinished. Work did not restart until the 1840s, and the edifice was completed to its original plan in 1880. Cologne's medieval builders had planned a grand structure to house the reliquary of the 3 Kings and fit its function as a place of worship for the Holy Roman Emperor. Despite having been left incomplete during the medieval period, Cologne Cathedral eventually became unified as"a masterpiece of exceptional intrinsic value" and"a powerful testimony to the strength and persistence of Christian belief in medieval and modern Europe".Source: Wikipedia
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