The World's New Tallest Building
Ahmed Jadallah / Reuters
Giant in the Sky
The Burj Khalifa is now the tallest tower in the world, at 2,717 ft (828 m). The tower opened Jan. 4, 2010; its construction cost more than $1.5 billion.
Get the Latest Photos from Time.com
Get TIME photos and pictures of the week delivered directly to your inbox.