Night View Of Twin Tower At Malaysia - The Petronas Twin Towers were the tallest buildings in the world until Taipei 101 was completed in 2004, as measured to the top of their structural components(spires, but not antennas). Spires are considered integral parts change the appearance and design of the building, whereas antennas may be added or removed without such consequences. The petronas Twin Tower remain the tallest twin building in the world.