Planning fallacy
The Sydney Opera House was expected to be completed in 1963. A scaled-down version opened in 1973, a decade later. The original cost was estimated at $7 million, but its delayed completion led to a cost of $102 million.
Sydney Opera House
The facility features a modern expressionist design, with a series of large precast concrete "shells", each composed of sections of a sphere of radius, forming the roofs of the structure, set on a monumental podium. The building covers of land and is long and wide at its widest point. It is supported on 588 concrete piers sunk as much as below sea level.