Go inside the most famous secret military base on Earth to expose the high-tech security, undercover operations, and most outrageous claims surrounding the 575 square miles of "restricted" space. What actually goes on at Area 51? Is there a connection between Area 51 and the Roswell event of 1947? Could there be a secret subterranean city underneath the barren desert? Have the conspiracy theories surrounding Area 51 been a smokescreen for controversial military projects? While the government may never reveal what it's really hiding at Area 51, many believe it is a place where truth is stranger than fiction. - HISTORY.
WATCH: Area 51 - America's Book of Secrets.
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