Like others, I've visited Auschwitz. I took pictures and felt guilty for doing so, for intruding, for being a gawper. They aren't touristy or selfies, just reflective of another time and life. I did so that I could look back in time to reinforce a fading memory. In time, when the last survivors have gone the resurgent deniers, the antisemites, the racists and haters, I will have proof to myself that it happened, that it existed, and that it was done by human beings.
