Number 4 on our list of largest construction projects is Crossrail. It is proclaimed as the largest construction project in Europe. Construction of the 118 km underground tube that runs through the city of London began in 2009 and is scheduled to open in 2019 at an estimated cost of $15 billion pounds sterling.
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3: St. Gotthard Base Tunnel
This tunnel follows under the Alps, not a city, and extends around 56.3 km. BBC made a good report on this. Its magnificence is not only is the fact that it is the longest railway tunnel in the world but the role it plays in the transportation of neighboring countries, too. Being the change of life for so many people, although it may seem humble when compared to others in this selection, it deserves meritoriously, a place in the selection of the wonders of building in the modern world.