The grave site of Francis Scott Key, an attorney and author of “The Star-Spangled Banner,” is one of about five locations in the United States that has been authorized by Congress to fly the American flag twenty-four hours a day. It is particularly fitting that it be unfurled continuously at Key’s grave because of one of the important and famous lines of the national anthem of the United States—“Gave proof thro’ the night that our flag was still there.”