United Arab Emirates
Concierge.com's insider take:
The world's tallest skyscraper, the Burj Khalifa (formerly known as the Burj Dubai) officially opened at the beginning of 2010. At 2,625 feet high, the building towers nearly a thousand feet above its closest rival, Taiwan's Taipei 101. The $1.5 billion Burj Khalifa comprises both residential and commercial areas, including the first Armani Hotel. For those with a head for heights, the building also features the world's highest observation deck (on the 124th floor) and 57 superfast elevators, which take only two minutes to reach the top (more than 160 floors up).