Petronas Towers, Kuala Lumpur, Malaysia (452 m) : Petronas Towers, twin skyscrapers in Kuala Lumpur, Malaysia, that are the world's tallest twin towers. Standing 1,483 ft (452 m) high, they were designed by the Argentinean-American architect Cesar Pelli. Completed in 1997. The Petronas Towers rise to 452 meters high, formerly held the "official" World's Tallest Building titles for seven years, from 1998 to 2003, due to their decorative spires. However, this is only possible by the spires atop the two buildings.
Buildings were built on the world's deepest foundations. The 120-meter foundations were built by Bachy Soletanche, and required massive amounts of concrete. Supported by 23-by-23-metre concrete cores and an outer ring of widely-spaced super columns, the towers use a sophisticated structural system that accommodates its slender profile and provides from 1300 to 2000 square metres of column-free office space per floor. The towers feature a skybridge (constructed by Kukdong Engineering & Construction) between the two towers on 41st and 42nd floors. The bridge is 170 m high and 58 m long.