Peronas Twin Towers were the tallest buidings in the world from 1998 to 2004 and remain the tallest twin towers in the world. The buildings are a landmark of Kuala Lumpur,Malaysia. The towers were designed by Argentine American architect Cesar Pelli.They were start to build from 1993.The buiding was officially opened by the Prime Minister of Malaysia's Tun Dr.Mahathir bin Mohamad on 1 August 1999.