Dachau is left standing because it must be. All the Dachaus -- all the Belsens, all the Buchenwalds, all the Auschwitzes -- all of it. They must remain standing because they are a monument to a moment in time when some men decided to turn the Earth into a graveyard. Into it they shoveled all of their reason, their logic, their knowledge...but worst of all, their consciences. And the moment we forget this, the moment we cease to be haunted by its remembrance, then we become the gravediggers. Something to think about, something to dwell on and remember...not only in the Twilight Zone, but wherever men walk God's Earth.
Source: "Death's-Head Revisited," episode of The Twilight Zone, 1961
Contributed by: CajunGypsy