The Petronas Twin Towers were the tallest buildings in the world from April 15th, 1996 until October 17th, 2003 when Taipei 101 (Financial Center) was topped out at 508m (1676ft). Completed in 1997, the Twin Towers are a striking glass-and-steel combination with floor plans based on an eight-pointed star. The Towers were designed to symbolize strength and grace using geometric principles typified in Islamic architecture. The towers are also joined at the 41st and 42nd floors (175m above street level) by a 192ft-long (58.4m) double-decker skybridge - linking the two sky lobbies and facilitating the movement between the two towers. Inside the 6-storey tower retail podium, music lovers will have access to an 864-seat concert hall (the Dewan Filharmonik Petronas) - a venue of architectural and acoustic distinction), an interactive petroleum discovery center (PETROSAINS) will be made ready for science buffs and an art gallery.