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Royal Air Force Menwith Hill, UK

One of the United Kingdom's best-kept military secrets. Intelligence gathering facility during the cold war. Nobody knows what it's for. That is, except for the people who are in the know. We wonder who they may be. This secret base opened in 1954. The place was, throughout history, any conspiracy theorist's biggest dream (and possibly nightmare). What on Earth is going on behind that barbed wire, and what are those golf ball buildings for?

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Those are the type of questions that conspiracy theorists in the UK have been obsessed with ever since this place was built.