Hello how may I help you? What is the tallest building in the world ? I can definitely help with that record. It's the Burj Khalifa in Dubai. Want to know something else about this record? What year was it declared ? It was declared in 2010. Hope that helps. Yes . It's a big help. I am glad I could be of assistance. Want to know anything else? hmmm. What is the worlds expensive car ? The world's most expensive car is currently the Mercedes-Benz Maybach Exelero, at a cool $8 million. Woah, that's so expensive though. Lastly, who the oldest person pf all time ? Jeanne Calment who lived to 122. Thanks for using WR bot.