1. The Big Dig, USA – $14.8 billion
The Big Dig definitely deserves the name, and the winning place on our list of 10 most expensive highways in the world, considering the funds invested in this enormous project. Burrowing beneath Boston, it was one of the most challenging constructions of all time, and the constructors thought at first that $2.8 billion will be enough to finish the work. Finally, the total cost went up to $14.8 billion, making this highway the most expensive in history.
