Sydney Opera House
The cost of the project so far, even in October 1966, was still only $22.9 million, less than a quarter of the final $102 million cost. However, the projected costs for the design were at this stage much more significant.
History of Sydney
To relieve congestion on the Sydney Harbour Bridge, the Sydney Harbour Tunnel opened in August 1992. The 2.3 kilometer underwater tunnel cost A$554 million to construct. Built to withstand earthquakes and sinking ships, in the early 21st century it carries around 75,000 vehicles a day.