Kingdom Tower, Jeddah, Saudi Arabia

Expected to cost $1.2 billion to construct, Kingdom Tower will be a mixed-use building with a luxury hotel, office space, serviced apartments, luxury condos, and the world's highest observatory.

The Tower will be built in Jeddah, Saudi Arabia and will soar over 550 feet taller than the United Arab Emirates' Burj Khalifa. The height of the Kingdom Tower will require the world's most sophisticated elevator system, and the building will have a total of 59 elevators.

When finished, it will become the tallest building in the world - but who knows for how long.

Height: 3,281 feet, Floors: 167
Completion: 2018

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