H.L. (CSS) Hunley Submarine
Dubbed as the "World's First Successful Combat Submarine," this underwater vessel's history started in the Civil War. Before the war ended, the submarine would attack and be attacked in return. She would fall to the bottom of the sea where she would wait over a hundred years for discovery - although there are some disputes on who was the first discoverer. In any case, this is one of the most important discoveries of the 20th century with many of the artifacts in tact - making the value of the vessel around $40 million dollars. The museum has the found artifacts on display including facial reconstructions of the men who died while serving.