Stone Mountain, Georgia, sometimes called the “Mount Rushmore of the Confederacy,” is home to one of the largest stone carvings in the world: An image of Confederate leaders Jefferson Davis, Robert E. Lee and Stonewall Jackson is etched into the side of the mountain. “Monumental Problems,” Part III, focuses on Stone Mountain and the “Lost Cause” narratives still widely spread by powerful families and corporations, and how these falsehoods fan the fires of white nationalism.