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Last Updated: Monday January 04 2010 17:24 GMT

See the world's tallest tower!

The world's new tallest building has officially opened.

The Burj Khalifa towers more than 800m over the city of Dubai in the Middle East.

It's more than twice the height of the Empire State Building in New York and is so tall it can be seen 60 miles away.

It's been specially designed to withstand earthquakes and strong winds, and it's already survived being hit twice by lightning!