www . eurotunnel . com / uk / build

PRICE TAG : $ 22.4bn DATE : 1994

The tunnel that links the south coast of England to France took more than five years to finish – it started in 1988 and finished in 1994 – and has been given the impressive title of one of the seven wonders of the modern world . It also redefined collaboration between the UK and France as 13,000 workers from both countries turned the idea into reality .

PRICE TAG : $ 23bn DATE : 2007

For those who lived in Boston , Massachusetts , the Big Dig was a part of everyday life for many , many years . It started in 1984 and ended in 2007 , but it ended up being the most complex , technologically challenging and remarkable highway project in the USA . According to the official site , during the peak construction time , $ 3mn

of work was done each day .

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