The Saudi Royal family has its sights set high -- a mile high to be exact. The family wants to build the world's tallest tower in Jeddah, Saudi Arabia. The Kingdom Tower, as it is being called, would include offices, residences and a hotel. The tower's height would surpass that of the current holder of the "world's tallest" title, the 2,716.5-foot Burj Khalifa in Dubai. The skyscraper is expected to cost at least $20 billion to build.
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