Mirror, mirror on the wall what’s the tallest structure in the world? That would be the Burj Khalifa in Dubai, United Arab Emirates, a shimmering 828 metre silver skyscraper. It has 160 habitable floors and 11 mechanical floors and cost 1.5 billion US dollars ! It takes a team of people four months to clean its whole exterior. Might be a good job for Spiderman! If you want to know more about the mega structures in the world, why don’t you check out Towering Giants and Other Tall Megastructures by Ian Graham. You’ll be amazed at how we are reaching for the sky.