A Listly List - Kuala Lumpur, often referred to simply as KL, is a city that seamlessly blends the old with the new. While many people are familiar with its iconic skyline and rich cultural heritage, there are some lesser-known facts about KL that might just surprise you. - Kuala Lumpur Was Once a Tin Mining Hub, Kuala Lumpur Is a Melting Pot of Cultures, The Petronas Twin Towers Were the Tallest Buildings in the World, The Kuala Lumpur Tower Has a Glass Sky Box, and Kuala Lumpur is Home to the World’s Largest Covered Bird Park