All the Dachaus must remain standing. The Dachaus, the Belsens, the Buchenwalds, the Auschwitzes — all of them. 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 conscience. And the moment we forget this, the moment we cease to be haunted by its remembrance, then we become the gravediggers.

Rod Serling (1924-1975) American screenwriter, playwright, television producer, narrator

The Twilight Zone, 3×09 “Deaths-Head Revisited,” Epilogue (10 Nov 1961)