4. The Hudson Tunnel Project (New York and New Jersey)
Estimated Cost: $13 billion
This project has been making a buzz for quite a long time now, even though its expected opening would be by 2045. The very long planning phase justifies how grand this project really is. With an objective to improve how people commute in the biggest cities in America, this project isn’t just noteworthy for being expensive, but is also lauded for its objective to improve lives.
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