The roof is constructed of a series of precast concrete &quot;shells&quot;. The roofs of the Sydney Opera House are covered in a subtle chevron pattern with 1,056,006 glossy white- and matte-cream-colored Swedish-made glazed ceramic  tiles from H&ouml;gan&auml;s AB though, from a distance, the shells appear a uniform white...Architect: J&oslash;rn Utzon. Structural engineer: Ove Arup &amp; Partners. Completed: 1973. UNESCO World Heritage Site 2007