Overview: Best-selling author Brad Meltzer and the team search for the true meaning of the mysterious Georgia Guidestones. Often called America's Stonehenge, this granite monument is located on a remote hilltop outside Atlanta. Brad and the team examine the multilingual messages carved into the stones for any clues to the monument's anonymous creator, who's known only by the pseudonym -- J.C. Christian. The Decoded team checks out rumors that the Guidestones are really the work of a secretive religious sect called the Rosicrucians, who've been accused of practicing alchemy and mind control.