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
This Wikipedia article was originally based on the "Sydney Opera House", listed on the "New South Wales State Heritage Register" published by the Government of New South Wales under CC-BY 3.0 AU licence (accessed on 3 September 2017).