It is one of the most secure structures in the world. It safeguards the vast wealth of the United States... See more in Season 1, Episode 3, "Fort Knox." #AmericasBookOfSecrets Subscribe for more from The UnXplained Zone and other great shows: https://aetv.us/subscribe_unxplainedzone From mysterious and supernatural occurrences, to extraordinary stories and investigations of the unknown, The UnXplained Zone is your portal to the paranormal. Follow the evidence, uncover the cover-ups, and discover what lies behind mankind’s greatest mysteries and the world’s strangest phenomenons. Welcome