McHenry and Dix are two forts located in Maryland and Virginia, respectively. They were both built during the War of 1812 to protect the Chesapeake Bay from British invasion. McHenry was named after James McHenry, a signer of the United States Constitution, while Dix was named after John Adams Dix, a Union general during the Civil War. Both forts are now part of the National Park Service and are open to the public for tours and educational programs.