OK, architecture fans. Check out this site to see a beautiful comparison of skyscrapers that are now being built around the world. Tellingly, most of them are located in China and the Middle East. The one you see here is already the tallest in the world at 1700+ feet; when completed next year, it'll be something like 2600 feet tall - the exact height is still a secret. It's in Dubai.
By comparison, the Sears Tower (the tallest in the U.S.) is 1720 feet tall.