“They looked back.  Dark yawned the archway of the Gates under the mountain-shadow.  Faint and far beneath the earth rolled the slow drum-beats: doom.  A thin black smoke trailed out.  Nothing else was to be seen; the dale all around was empty.  Doom.  Grief at last wholly overcame them, and they wept long: some standing and silent, some cast upon the ground.  Doom, doom.  The drum-beats faded.”

–from The Lord of the Rings: The Fellowship of the Ring by J. R. R. Tolkein