Petronas Towers

The Petronas Towers, also known as the Petronas Twin Towers (Malay: Menara Petronas, or Menara Berkembar Petronas) are twin skyscrapers in Kuala Lumpur, Malaysia. According to the CTBUH's official definition and ranking, they were the tallest buildings in the world from 1998 to 2004 until surpassed by Taipei 101, but they remain the tallest twin building in the world. The buildings are the landmark of Kuala Lumpur with nearby Kuala Lumpur Tower.
The towers were designed by Argentine architect César Pelli. They chose a distinctive postmodern style to create a 21st-century icon for Kuala Lumpur. Planning on the Petronas Towers started on 1 January 1992 and included rigorous tests and simulations of wind and structural loads on the design. Seven years of construction followed, beginning on 1 March 1993 with the excavation, which involved moving 500 truckloads of earth every night to dig down 30 metres (98 ft) below the surface.

The next stage was the single largest and longest concrete pour in Malaysian history. 13,200 cubic metres (470,000 cu ft) of concrete was continuously poured through a period of 54 hours for each tower. This record-breaking slab with 104 piles forms the foundation for each tower.

From this floor rose a 21-metre (69 ft) high retaining wall, with a perimeter length of over 1,000 metres (3,300 ft). This concrete shell and the basement area it enclosed required two years to complete, and up to 40 workers on site 24 hours per day.