The Millennium Dome was designed and built between 1996 and 1999 to house the ­Millennium Experience exhibition. The idea was the outcome of an interaction between the ­designers, Imagination, and the architects, ­Richard Rogers. It was then taken up by the engineers at Buro Happold, who developed the concept of the tensioned fabric-and-cable roof. The structure has now become the icon for the millennium celebrations in London. (Ian Liddell)

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