In 2000, the tallest buildings in the world were the Petronas Twin Towers in Kuala Lumpur, Malaysia.
The towers are each 88 stories and 1,483 feet (452 m) tall.
But at least two other buildings that are taller.
The World Financial Center in Shanghai, China, has 94 stories and rises to 1,509 feet (460 m).
The 1,884-foot (574 m) Kowloon Mass Transit Railway Tower is located in Hong Kong.
In 2010, the tallest building in the world was the Burj Khalifa in Dubai, United Arab Emirates, at 2,717 feet, with 162 floors.
The Burj Khalifa is also the tallest man-made structure ever built in 2010.
Construction of the building began on 21 September 2004, and the total cost for the project was about US$1.5 billion.