The Most Expensive Construction Projects Ever

 A nightmare in planning and massively over budget, the Big Dig cost taxpayers an estimated $23.1 billion. The project had to do with rerouting some major highways in the Boston area. The main artery of the road network in the area, Route I-93, was REDIRECTED to go directly beneath the heart of the city in an addition called the Thomas P. O’Neill Jr. Tunnel.The project was plagued with financial and administrative PROBLEMS, including some major design flaws which the state payed nearly $400 million in restitution for.