As a 155-year-old legend goes, a Union Army wagon train left Wheeling, W.Va., before the Battle of Gettysburg, carrying two tons of gold, but never completed its 400-mile mission. The gold was supposed to be used to pay Union soldiers. But it first had to make it to the U.S. Mint in Philadelphia, according to the Associated Press. It never did. The wagon train traveled northeast and was last spotted in St. Marys, Pa. Searchers found the wagons and the bodies of dead soldiers — and the gold was gone. But maybe not forever. On Friday, dozens of FBI agents,...