Holding the distinction of having the world’s tallest building is a coveted milestone for designers, builders, and countries alike, but no one has been able to top the 2,722 foot tall Burj Khalifa yet, since it opened in early 2010. The 2nd tallest tower in the world, the Shanghai Tower, opened 5 years later and stands 2,073 feet tall. Just recently, two more gigantic buildings opened their doors, taking over the 4th and 5th spots on the list for tallest in the world, pushing America’s One World Trade Center into 6th place.