Petronas Twin Towers, Kuala Lumpur

The Petronas Twin Towers remain the tallest twin towers in the world, a title they have held for over 25 years since their 1998 completion. The sky bridge on the 41st and 42nd floors is a structural marvel, and the towers attract 1 million visitors annually, making them Malaysia's most-visited landmark. Their height once claimed the world's tallest building crown.