If you happened to wander into the Nevada desert and stumbled upon the secret U.S. military base, Area 51, you'd quickly be ...

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Physicists discovered that the famous ‘Star Trek’ spaceship got a lot right about designing a ship to jump from galaxy to ...

They are so secret that most people aren't even aware of their existence: There are places in the world that ordinary people ...

Most places on Earth can be explored online, and many can be visited in person with the right planning. But a few spots are ...