Three years ago, agents from the Federal Bureau of Investigation (FBI) were digging in a rural area in the American state of Pennsylvania. No one knew why. Now, recently released emails have answered that question. They were looking for a very valuable and secret amount of gold from the time of the American Civil War. On March 13, 2018, treasure hunters led the FBI to Dent’s Run, about 220 kilometers northeast of Pittsburgh. At that place, there has long been a story that an 1863 shipment of Union gold was either lost or stolen on its way to the U.S. Mint in Philadelphia. The Union was the name of the northern states during the civil war. The FBI has always refused to confirm why exactly it went digging. But, they say, they found nothing.