National Oceanic and Atmospheric Administration, Virginia.
Monitor National Marine Sanctuary was designated as the nation's first national marine sanctuary. It protects the wreck of the famed Civil War ironclad USS Monitor, and the sanctuary works with partners to honor and interpret it for the American people. Although the wreckage is not easily accessible, visitors can still enjoy this historical site by diving below the surface (must have a permit) or interacting with exhibits related to this time in history.
16 miles southeast of Cape Hatteras, North Carolina.