The Burj Khalifa in Dubai is the world's tallest man-made skyscraper, at 829.8 meters (2,722 feet). When it opened on January 9, 2010, the skyscraper was officially designated as the "tallest building in the world" and the tallest self-supported structure. The previous titleholder, the Sears Tower in Chicago, was built under controversial conditions involving the use of toxic materials in its construction.
The second-highest skyscraper is the Shanghai World Financial Center, now known as the Jin Mao Building, which is 740 meters tall (about 2,500 feet). It is still under construction and when completed will be the second-tallest building in the world behind the Burj Khalifa.
There are several other buildings that are over 700 meters tall and being constructed or planned for various cities around the world. None of them have been finished yet so they cannot claim the title of world's tallest building but they are all expected to reach this height or higher.
It is estimated that the cost of constructing the Burj Khalifa is $1 billion. At the time of its completion, it was the most expensive building ever erected.
The basic formula to calculate the height of a skyscraper is simply floor space divided by the density of steel used in its construction.
The Burj Khalifa At 829.8 meters, the Burj Khalifa skyscraper is the world's tallest building (2,722 ft). Guyed masts (such as telecommunication masts), self-supporting towers (such as the CN Tower), skyscrapers (such as the Willis Tower), oil platforms, electrical transmission towers, and bridge support towers are among the structures included. The list is limited to functional buildings over 30 meters high.
The Giza Pyramids at Giza, Egypt were built around 5500 years ago for Pharaoh Khufu. They are the largest and oldest pyramids in Egypt. Today, they are a popular tourist attraction - the centerpiece of the Great Pyramid Complex, one of the World Heritage Sites of the African continent. The name "pyramid" comes from the French word piéride, which means "three-sided shape".
Pyramids have been used throughout history as tombs, but only three civilisations have built pyramids: Egyptians, Mexicans, and Indians. Both the Egyptians and Mexicans built many more pyramids than just the three most famous ones, which is why they are called "the old civilizations". India had a large population and no evidence of pyramids being used for burial, so they are considered "younger" than the others. However, there are several hundred rock shelters across India where ancient humans may have slept during cold seasons or when away from home performing rituals - these are not considered to be actual pyramids since they lack the structural integrity to be considered such.
The Burj Khalifa, at over 828 meters (2,716.5 ft) and more than 160 floors, holds the following records:
There are currently just three such structures: the Burj Khalifa in Dubai, which rises at 2,717 ft. and was finished in 2010, the Shanghai Tower, which was completed in 2015 in Shanghai, China, and sits at 2,073 ft., and the Makkah Royal Clock Tower, which stands at 1,972 ft. and was built in 2009.
The tallest building on Earth is now also the highest occupied building, thanks to the Burj Khalifa in Dubai. It used to be thought that the second-highest occupied building was the Reichstag, but research has shown that this belief is incorrect. The highest occupied building is now the Burj Khalifa, followed by another Dubai skyscraper called the World Trade Center Dubai. They stand at 2,716 and 2,004 feet, respectively.
The world's third-tallest building isn't actually a building at all, but rather a tower block. The Stansted High Street Bridge in London is designed to look like an upside-down Stansted Airport jet plane landing gear, and it reaches 914 feet high. It was completed in 2006 and is owned by Stansted New Town Partnership.
The fourth-tallest building is the Petronas Towers in Kuala Lumpur, Malaysia. These twin towers are 1,483 feet tall and were built in 1994. The fifth-tallest building is the Huaxi Building in Chengdu, China, which is 1,442 feet tall. It was built in 2008.