Burj Khalifa, Dubai, UAE (US$1.5 billion)
The tallest building in the world, Dubai’s
Burj Khalifa was completed in 2010 to the tune of US$1.5 billion, a
steal compared to some of the others on this list. Soaring at a height of 828 metres (2,716.5 feet) tall, the
building comprises a mix of office space, ultra-luxurious hotel and residential units and, of course, an observation deck that blows all other observation decks out of the water.