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Closeup of one of the Petronas Twin Towers in Kuala Lumpur. These 88-floor towers – the tallest twin towers in the world – were completed in 1998. A two-story skybridge on the 41st and 42nd floors connects the towers and is the highest two-story bridge in the world. A double-decker elevator system is used in the towers – the bottom part for odd floors, the top part for even floors.