In Chicago, Illinois, the Willis Tower, which was once called the Sears Tower is the fifth largest building in the world. The 108-story building is 1,450 feet (442 m) high and is a common tourist attraction in the Windy City.
In 1973, when the building opened, it was the tallest building in the world. Now, the building is ranked the tallest in the U.S.A. Though the building is no longer officially named the Sears Tower since Sears naming rights ended in 2003, many people still refer to the tower as such.
In the center is the Shanghai World Financial Center, and at left the Jinmao Tower. The Shanghai World Financial Center was the second tallest building in the world when it was built in 2008, with a height of 1,614 ft. (492 meters). Located in Pudong, Shanghai, China, the building is home to many shops, offices and hotels, including the Park Hyatt Shanghai, the highest hotel in the world.
Malaysia's landmark Petronas Twin Towers and KL Tower stand in the Kuala Lumpur city center in Kuala Lumpur, Malaysia. From 1998 to 2004, the Petronas Twin Towers were the the tallest in the world. Taipai 101 beat the towers, so they are now just the tallest twin buildings in the world at 1,483 ft. (452 meters).
(AP Photo/Vincent Thian, FILE)
Taipei 101, or the Taipei Financial Center, was the world's tallest skyscraper in 2004. Located in Taipei, Taiwan, the building is 1,671 ft. (509.2 meters) and has 101 floors.
(AP Photo/Wally Santana)
The Burj Dubai, which is Arabic for "Dubai Tower," stands at 2,717 feet (828 meters) and is like a virtual city reaching nearly a half mile to the sky. The building boasts the most stories and highest occupied floor of any building in the world, and ranks as the world's tallest structure, beating out a television mast in North Dakota. Its observation deck -- on floor 124 -- also sets a record.