Akashi Kaikyō Bridge (Japan) completed in 1998 at a cost of Y500 billion or $6 billion (converting to USD using this data and then adjusting to 2011 dollars. It is the longest suspension bridge in the world and it is probably Japan’s greatest engineering feat.
It took two million workers ten years to construct the bridge, 181,000 tonnes of steel and 1.4million cubic metres of concrete. The steel cable used would circle the world seven times.
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