18 – Area 51, United States

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Area 51 is a highly restricted remote military base in the Nevade Desert which is closely guarded from the public. Conspiracy theorists often claim the purpose of Area 51 is for the storage and examination of alien spacecraft, meetings with extra terrestrials and many other wild theories that often draw links with the Roswell event.

The real reason Area 51 exists is still a mystery and remains highly classified. Trying to enter would be irresponsible though since it is surrounded by signs warning that security is authorized to use deadly force on people who insist on trespassing.