Sydney Opera House
Jørn Utzon's winning entry in an international architectural competition in 1957 was said to have been excluded by the technical judging panel, but later reinstated on the recommendation of one of the judge, architect Eero Saarinen who would not endorse any other design.
Work on the Sydney Opera House started in 1959. Geometrically, each half of each shell is a segment of a sphere; however, the 'sails' were originally designed as parabolas, for which an engineering solution could not be found. The opera house is supported on 580 concrete piers sunk up to 25 metres belows the sea level.