We recently came back from a trip that included cities in Germany. Included in those tours was an explanation of these small brass squares installed in cities in Germany to recall victims of the holocaust. Here's a link. http://en.wikipedia.org/wiki/Stolperstein
Apparently there is some controversy about them, of course there's always controversy, but I found them incredibly moving. The German tour guides told me they made sure their own children were read the names on each "stone" they passed, and the stories were told. Their kids grew up hating Hitler and what he stood for.
My own family came from the Ukraine, early in the century, so escaped that later persecution, but I have a number of friends whose parents and grandparents were directly impacted by events in Nazi Germany. Those friends were all Jews, but of course, not all Hitler's victims were Jews.
One of the "stones" was defaced by chewing gum. The guide was quite upset. It's hard to tell if it was purposeful. FWH bend down to clean it off...
Quite an experience.