Source: msnbc.msn.com, Wikipedia.org, WashingtonPost.com
| Rank | Project | Cost |
|---|---|---|
| 1 |  International Space Station |
over 100 billion |
| 2 |  Three Gorges Dam , China |
34.38 billion |
| 3 | The Manhattan Project |
20 billion (todays money) |
| 4 | Big Dig , Boston |
14.6 billion |
| 5 | Gerald R. Ford Class Aircraft Carrier |
8.1 billion |
1.The International Space Station
The International Space Station (ISS) is an internationally developed satellite currently being assembled in Low Earth Orbit. Primarily a research laboratory
2.The Three Gorges Dam
The Three Gorges Dam is the world’s largest hydropower project and most notorious dam. The massive project sets records for number of people displaced (more than 1.2 million), number of cities and towns flooded (13 cities, 140 towns, 1,350 villages), and length of reservoir (more than 600 kilometers). The project has been plagued by corruption, spiraling costs, technological problems, human rights violations and resettlement difficulties.
3.The Manhattan Project
Alamogordo, N.M., July 16, 1945 (first atomic bomb)
In 1934, German scientists discovered nuclear fission, the splitting of an atom of uranium into two elements. Five years later, Albert Einstein wrote a letter to President Roosevelt describing the potential power of a nuclear bomb. Einstein opposed the use of nuclear weapons, but he feared what might happen to the world if Germany discovered the technology before America.
4.Big Dig, Boston
Big Dig is recognized as the largest, most complex, and technologically challenging highway project in the history of the United States, the Central Artery/Tunnel Project significantly reduced traffic congestion and improved mobility in one of America's oldest and most congested major cities.
5.The Gerald R. Ford-class aircraft carriers
The Gerald R. Ford-class aircraft carriers (or Ford-class) are a planned class of supercarrier for the United States Navy, intended to replace the current Nimitz-class carriers.