Visit http://brilliant.org/neo/ to get started learning STEM for free, and the first 200 people will get 20% off their annual premium subscription. Follow neo on social media: Twitter: twitter.com/NeoExplains Facebook: facebook.com/NeoExplains Video Description: Ever since the Burj Khalifa became the world's tallest building upon completion in 2010 Dubai has held the title. And that despite many announcements about projects worldwide set to dethrone the Burj Khalifa, such as the Jeddah Tower (Kingdom Tower) in Saudi Arabia, the Azerbaijan Tower, the Sky Mile Tower in Tokyo or the Creek Tower. This video explores the difficult projects and looks at their current state. Images via Getty