[See pinned comment for an important update.] In a field near Elberton, Georgia, USA, sit a set of mysterious standing stones: mysterious not because they're ancient, but because they were funded by someone anonymous in 1980, perhaps as a message to any survivors of the end of the world.

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The closing music is "Nearer My God To Thee", recorded by the US Marine Band c.1896, from the USCB Cylinder Audio Archive, cleaned and sped up: http://www.library.ucsb.edu/OBJID/Cylinder8785