Eternal Light Peace Memorial, Gettysburg Battlefield, 2014

As Wikipedia explains, the Eternal Light Peace Memorial is "a 1938 Gettysburg Battlefield monument commemorating the 1913 Gettysburg reunion for the fiftieth anniversary of the 1863 Battle of Gettysburg." It's difficult to see in this photo, but a natural gas flame--a "Flame of Eternal Peace"--burns continuously in the metal urn at the top of the memorial.

For an earlier view of the monument, see A Beam of Light at the Light of Peace, 1969.