Burj Dubai

On July 21, construction reached 1,680 feet on the 141st floor of the Burj Dubai tower in Dubai, United Arab Emirates, making it the largest building in the world. The skyscraper is now 13 feet above the former record holder, Tapei 101 in Taiwan, which is 1,667 feet above the ground.

Burj Dubai is the tallest building now, and according to the official site, it's nowhere near finished. The final height and number of stories are a secret.