The "Lincoln Gun," a 15-inch Rodman Columbiad at Fort Monroe, Va. The gun's barrel alone weighed 49,000 pounds. Two types of ammunition were fired from this weapon -- a 450-pound solid shot, and a 330-pound explosive shell carrying a 17-pound bursting charge.
July 3, 2013 10:57 AM PDT
Photo by: Library of Congress, Prints & Photographs Division