Bridging the Gap with Billions: The World's Most Expensive Bridge Endeavors

3. USA's Tappan Zee Bridge

Situated in: USA's New York Founded: 1955 for the original, 2017 for the replacement Expense: Original cost was $81 million; replacement cost was $4 billion. An iconic feature of the New York skyline, the Tappan Zee Bridge has long represented development and connectedness in the Empire State. When it was first built in 1955, this enormous building connected the Lower Hudson Valley towns of Tarrytown and Nyack and functioned as a crucial lifeline.

USA's Tappan Zee Bridge Wikipedia Commons/Komzet But as time went on and traffic volume increased, it became clear that the dilapidated bridge needed a contemporary makeover to keep up with the changing expectations of the community. The $4 billion replacement of the Tappan Zee Bridge was intended to be more than just an update; rather, it was to be a cutting-edge marvel that would raise the bar for bridge architecture.