List of tallest buildings and structures
The world's tallest artificial structure is the 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.
List of tallest buildings in the United States
As of 2018, One World Trade Center in New York City is considered to be the tallest skyscraper in the United States. Its spire brings the structure to a symbolic height of , connoting the year The Declaration of Independence was signed, though the tip of the structure actually is measured at . However, using the more common criterion for the height of a building (the roof, not antenna) the observation deck elevation and highest occupied floor of One World Trade Center are surpassed by Chicago's Willis Tower (formerly and still commonly known as the Sears Tower) and 432 Park Avenue.