Fort McHenry, in Baltimore, Maryland, is a coastal star-shaped fort best known for its role in the War of 1812, when it successfully defended Baltimore Harbor from an attack by the British navy in Chesapeake Bay September 13–14, 1814. Wikipedia

Fort Sumter is a Third System masonry sea fort located in Charleston Harbor, South Carolina. The fort is best known as the site upon which the shots that started the American Civil War were fired, at the Battle of Fort Sumter on April 12, 1861. Wikipedia