This impressive video shows how the tallest building in the world will look when it's completed—just 90 days after construction begins next month.

While work didn't start in March as originally planned, China is still going ahead with its 2,749 feet (838 meters) SkyCity. From our previous coverage:

According to the construction company, the skyscraper will be built in just 90 days at the unbelievable rate of five floors per day.According to its engineers, this will be the tallest skyscraper in the world by the end of March of 2013. Its name is Sky City, and its 2,749 feet (838 meters) distributed in 220 floors will grow in just 90 days in Changsha city, by the Xiangjiang river. Ninety days!

Some experts people estimate that Sky City will be completed—interiors and all—by January 2014. This is the same firm that built a full 30-story hotel in 15 days—which is still standing and in perfect working condition. Whatever time it is at the end, it will still be a phenomenal achievement.