Don Wildman examines a boulder covered in strange carvings, which could turn American history on its head; a sword belonging to an explorer accused of treason; and the marble bust of a great leader who tried to untangle an ancient puzzle. Also in this episode is the story of an heroic Marine helicopter pilot who rescued 8 other Marines who were under fire by the Viet Cong, and Babbage's "Difference Machine".

Don Wildman inspects a book about a four-legged mathematician, examines the birth of the automobile and investigates a mysterious underground corkscrew.