1Area 51, Nevada

The U.S. government wouldn’t admit Area 51 existed until 1992 documents released in 2013 mentioned the Nevada military base.

Officials still haven’t revealed what type of research goes on, though conspiracy theorists claim alien activity there.  You can get a bird ‘ s-eye view of the spot on Google Maps, but the sprawling desert makes it hard for anyone to sneak in, and security is tight.

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