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Camp Century Camp Century: The Cold War City Under the Greenland Ice Places
The Kola Superdeep Borehole The Kola Superdeep Borehole: The Deepest Hole Ever Drilled Places
Project Riese Project Riese: Hitler’s Unfinished Tunnels in the Owl Mountains Places
Todt Battery Battery Todt: The Concrete Giant of the Atlantic Wall Places
Sound Mirrors The Sound Mirrors of Kent: Concrete Ears That Listened for Enemy Aircraft Places
The Trestle The Trestle: The Wooden Giant Built to Test Bombers Against a Nuclear Pulse Places
Fordlandia Fordlândia: Henry Ford’s Lost Town in the Amazon Places
Operation Gunnerside Operation Gunnerside: Six Skiers and the Heavy Water Raid Events

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