I'm not sure whether you'd want to incorporate an audio aspect in your lesson,
but if you do, the group 10,000 Maniacs did a song titled "The Slowest Parade"
(I think that's it) which is a very interesting account of a young man's trip
to the Wall to deliver some letters which his father, killed in the war, had
written to his mother. I believe it's on their album "Blind Man's Zoo".