what country has the tallest building in the world
List of tallest buildings and structures The world's tallest artificial structure is the 829.8 m (2,722 ft) tall Burj Khalifa in Dubai (of the United Arab Emirates). The building gained the official title of "Tallest Building in the World" and the tallest self supported structure at its opening on January 9, 2010. The second tallest self-supporting structure and the tallest tower is the Tokyo Skytree. The tallest guyed structure is the KVLY-TV mast.
World Trade Center (1973–2001) When completed in 1972, 1 World Trade Center became the tallest building in the world for two years, surpassing the Empire State Building after a 40-year reign. The North Tower stood 1,368 feet (417 m) tall and featured a telecommunications antenna or mast that was added at the top of the roof in 1978 and stood 362 feet (110 m) tall. With the 362-foot (110 m)-tall antenna/mast, the highest point of the North Tower reached 1,730 feet (530 m).[89] Chicago's Sears Tower, finished in May 1973, reached 1,450 feet (440 m) at the rooftop.[91] Throughout their existence, the WTC towers had more floors (at 110) than any other building.[89] This number was not surpassed until the advent of the Burj Khalifa, which opened in 2010.[92][93] Each tower had a total mass of around 500,000 tons.[94]