It's a dinosaur of the Cold War: a 3-mile-long radar system designed to detect Soviet bombers screaming across the Atlantic.
The Over-The-Horizon Backscatter Radar, often described as the world's largest radar, was developed over 25 years for $1.5 billion and occupies an area nearly twice the size of New York's Central Park.
The AN/FPS-118 radar was by most accounts the largest radar in the world.
When operational, it could monitor a massive swath of ocean and warn of threats nearly 2,000 miles away.
Built in both Maine and Oregon, the radars picked up readings as far as 1,700 miles off both coasts.
Read more about it here.
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