A building is a man-made structure with a roof and walls standing more or less permanently in one place, such as a house or factory. Buildings come in a variety of shapes, sizes and functions, and have been adapted throughout history for a wide number of factors, from building materials available, to weather conditions, to land prices, ground conditions, specific uses and aesthetic reasons.

5. Taipei 101

Taipei 101

Taipei 101 stylized as TAIPEI 101, formerly known as the Taipei World Financial Center, is a landmark supertall skyscraper in Xinyi District, Taipei, Taiwan. The building was officially classified as the world's tallest in 2004, and remained such until the opening of Burj Khalifa in Dubai in 2010. In 2011, the building was awarded the LEED platinum certification, the highest award according the Leadership in Energy and Environmental Design (LEED) rating system, and became the tallest and largest green building in the world

4. One World Trade Center

One World Trade Center

One World Trade Center (also known as 1 World Trade Center, One WTC and 1 WTC; the current building was dubbed the "Freedom Tower" during initial basework) refers to the main building of the new World Trade Center complex in Lower Manhattan, New York City. It is the tallest skyscraper in the Western Hemisphere and the fourth-tallest in the world. The 104-story supertall structure shares a numeric name with the North Tower of the original World Trade Center, which was destroyed in the terrorist attacks of September 11, 2001. The new skyscraper stands on the northwest corner of the 16-acre (6.5 ha) World Trade Center site, on the site of the original 6 World Trade Center. The building is bordered by West Street to the west, Vesey Street to the north, Fulton Street to the south, and Washington Street to the east.

3. Abraj Al Bait

Abraj Al Bait

The Abraj Al-Bait Towers, also known as the Makkah Royal Clock Tower Hotel, is a government-owned megatall building complex in Mecca, Saudi Arabia. These towers are a part of the King Abdulaziz Endowment Project that strives to modernize the city in catering to its pilgrims. The central hotel building has the world's largest clock face and is the third tallest building and fourth tallest freestanding structure in the world. The building complex is metres away from the world's largest mosque and Islam's most sacred site, the Masjid al-Haram. The developer and contractor of the complex is the Saudi Binladin Group, the Kingdom's largest construction company. The complex was built after the demolition of the Ajyad Fortress, the 18th-century Ottoman citadel which stood atop a hill overlooking the Grand Mosque. The destruction of the fort in 2002 by the Saudi government sparked Turkish and international outcry.

2. Shanghai Tower

Shanghai Tower

The Shanghai Tower is a megatall skyscraper under construction in Lujiazui, Pudong, Shanghai. Designed by Gensler and owned by a consortium of Chinese state-owned companies, it is the tallest of a group of three adjacent supertall buildings in Pudong, the other two being the Jin Mao Tower and the Shanghai World Financial Center. The building stands approximately 632 metres (2,073 ft) high and has 128 stories, with a total floor area of 380,000 m2 (4,090,000 sq ft). Its tiered construction, designed for high energy efficiency and sustainability, provides multiple separate zones for office, retail and leisure use. The Shanghai Tower is projected to open to the public in mid-2015.

1. Burj Khalifa

Burj Khalifa

Construction began on 6 January 2004, with the exterior of the structure completed on 1 October 2009. The building officially opened on 4 January 2010, and is part of the new 2 km2 (490-acre) development called Downtown Dubai at the 'First Interchange' along Sheikh Zayed Road, near Dubai's main business district. The tower's architecture and engineering were performed by Skidmore, Owings and Merrill of Chicago, with Adrian Smith as chief architect, and Bill Baker as chief structural engineer. The primary contractor was Samsung C&T of South Korea. The tower's construction was done by the construction division of Al Ghurair Investment group.



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