Next airing Fri Dec 4, 10 p.m. ET

Secret History of Gold: Revealed

Gold's appeal and value span time and cultures, but there is a little-known secret to the story of gold. Most of the gold mined throughout history remains in circulation today -- even the gold closest to your heart may have dark origins. From the Amazon jungle to the markets of Dubai, NGC re-visits the underbelly of the modern gold trade with a treasure hunter and an illegal miner to expose its volatile history.