There will be an observation deck on the 818-metre Burj Dubai, on the 124th floor of the 160-floor building, officials have announced.  In addition to a 360-degree glass observation deck, an open-air balcony will also be available for those who have no fear of heights.  Shaun Killa, a Dubai architect and member of the Council on Tall Buildings and Urban Habitat, said that observation decks were the most important part of any giant skyscraper...more.