 A characteristic feature of the Opera building is the gigantic roof covering the entire building stretching all the way to the harbour front.Measuring 158 metres x 90 metres, the Opera roof is one of the largest roof constructions in the world.The innovative design of the roof, which Ramboll has projected in cooperation with Henning Larsen Architects, was the reason for the Opera winning "The 2008 IABSE Outstanding Structure Award".