Petronas Twin Towers Skybridge, Malaysia

Twin skyscrapers in Kuala Lumpur, Malaysia which were the tallest buildings in the world from 1998 to 2004 are linked by a double-decker skybridge on the 41st and 42nd floors, the highest 2-story bridge in the world. Interestingly, this skybridge isn’t attached to the main structure, but is rather designed to slide in and out of the towers to keep it from breaking. It offers visitors views of the city, and also functions as a safety devices, so tenants can evacuate from one tower into the other.