Before taking on the Burj Khalifa challenge, Robert climbed more than 70 towers, including New York’s Empire State Building, the Petronas Towers in Kuala Lumpur, and Chicago's Willis Tower.

Designed by the architectural firm Skidmore, Owings and and Merrill, the Burj Khalifa boasts 163 floors ... Symbols of modern Malaysia, the Petronas Twin Towers draw their allure from Malay ...