Hey, Duh, I know you are joshing me. However, for those victims of the public school system (i.e. commie indoctrination camp 101) I shall relate the following.
Ahem, students, the Star Spangled Banner was written by Francis Scott Key during the War of 1812. Key had been briefly imprisoned upon a British Man O'War in Chesapeake Bay, while trying to negotiate a friend's release.
As he watched the bombardment, he was amazed that the Stars and Stripes still flew (Paul Harvey has reported that the men of the garrison, realizing the import of the flying flag to the Americans, volunteered to hold Old Glory aloft after the flagpole was decimated - as each man died, another would crawl forward to take his place).
The "ramparts" thus are the walls of Fort McHenry, still standing in Baltimore, MD.
"And the rocket's red glare, the bombs bursting in air, gave proof through the night, that our flag was still there."