How the world's tallest skyscraper was built

In 2004, construction began on a new building in Dubai, promising a revolutionary design that would dwarf the rest of the world's skyscrapers. Five years later, the 828-meter Burj Khalifa was complete, surpassing the previous record-holder by over 60%. What innovations allowed for such a huge leap in height? Alex Gendler digs into the architecture of this unprecedented project. [Directed by WOW-HOW Studio, narrated by Addison Anderson, music by Stephen LaRosa].