Probably one of the first things that anyone visiting Kuala Lumpur for the first time would do. The Petronas Twin Tower used to be the tallest building in the world back in the year 1998, today, however, it stands as the world's tallest twin building. This gorgeous structure houses many things like a science museum, a cinema, various shops, a concert hall as well as a shopping mall. If you're travelling during the peak holiday season, make sure to get your passes quickly as only a limited number of them are issued.