Burj Khalifa, located in Dubai, is the tallest building in the world. It is 2,722 feet tall and has 163 floors. There are thousands of homes within it, as well as hotels for visitors. People can live and enjoy themselves without ever having to leave the building. There are stores, restaurants, a lake, a forest, play areas, and an observation deck at the very top from which people can look down at the whole city from above. Read more to learn how and why Burj Khalifa was built.