Burj Khalifa, also known as Khalfah, is a mixed-use skyscraper in Dubai, United Arab Emirates, that is the world's tallest building, according to all three of the basic criteria used to evaluate such structures (see Researcher's Note: Building Heights). Burj Khalifa ("Khalifa Tower"), formerly known as Burj Dubai, was officially named after Sheikh Khalifa ibn Zayed Al Nahyan, the ruler of the neighboring...