What Is the Most Expensive Project in the World
The most expensive project in the world is often cited as the International Space Station (ISS). According to public estimates, its total cost has exceeded 150 billion U.S. dollars over decades of design, assembly, and operation. The ISS is a habitable artificial satellite used for scientific research and international cooperation in low Earth orbit.
Why the ISS Is So Expensive
The ISS combines contributions from multiple space agencies, including NASA, Roscosmos, ESA, JAXA, and CSA. Its high cost comes from complex engineering, long-duration research, and the need for regular crew rotation and cargo resupply missions. Maintenance, upgrades, and safety systems add further expenses over the station's lifespan.
Other High Cost Projects
Other major undertakings such as large-scale energy plants, global infrastructure networks, and advanced defense systems also rank among the costliest initiatives. For broader context on major global expenditures, see the World Bank's overview of public investment at https://www.worldbank.org/en/topic/publicsector/brief/public-investment
