History of the world's tallest buildings
The tallest building in the world, as of 2022, is Burj Khalifa. The title of "world's tallest building" has been borne by various buildings, such as the Rouen Cathedral and the Empire State Building.
Contemporary architecture
Adrian Smith and his own firm are the architects for the building which, in 2020, will replace the Burj-Khalifa as the tallest building in the world. The Jeddah Tower in Jeddah, Saudi Arabia, is planned to be 1,008 meters, or (3,307 ft) tall, which will make it the tallest building in the world, and the first building to be more than one kilometer in height. Construction began in 2013, and the project is scheduled to be completed in 2020.