#8
International Space Station
$150 billion. 25+ years occupied. 270 astronauts from 21 countries.
The most expensive structure ever built ($150 billion), the ISS has hosted over 270 astronauts from 21 countries with continuous habitation since November 2000—more than 25 years. Orbiting at 28,000 km/h, it has enabled 3,000+ experiments spanning biology, physics, and materials science, including zero-gravity crystals.
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