1. Burk Khalifa
This residential and office tower officially became the world's tallest building when it opened its doors on Jan. 4, 2010.
Piercing the Dubai landscape at a height of just over 828 meters (2,716 feet) tall, the United Arab Emirates landmark and has more than 160 stories, the most of any building on Earth.
BIG PIC: Discovery News producer Ian O'Neill reports on the record-breaking Burk Khalifa's grand opening.
Information source: Council on Tall Buildings and Urban Habitat