AlDar HQ - The world's first circular skyscraper - Abu Dhabi 2010

This is extracted from a beautiful highly recommended National Geographic documentary titled, "Can it be Built? Circular Skyscraper". It is the world's first circular skyscraper. In the documentary, Engineers talk in gorgeous and generous detail about the innovations and obstacles that went into designing this piece of art which went hand in hand with building it in a record 30 months. All copyrights belong to National Geographic who filmed this project from start to finish.

Source : http://channel.nationalgeographic.com - You tube KnightMD