title: List of tallest buildings and structures
context: The world's tallest artificial structure is the 829.8-metre-tall (2,722ft) Burj Khalifa in Dubai (of the United Arab Emirates). The building gained the official title of "Tallest Building in the World" and the tallest self-supported structure at its opening on January 9, 2010. The second-tallest self-supporting structure and the tallest tower is the Tokyo Skytree. The tallest guyed structure is the KVLY-TV mast.
question: Where is the worlds tallest building?
answers: Dubai