How? When? The Holocaust?....
The Holocaust hasn't been forgotten, and so will not be repeated. Germany has built on the lessons of history and will not be repeating that mistake. They are making new mistakes today that will be learned from in due course.
North Korea does not have concentration camps, they have prison camps full of many political prisoners.
How many concentration camps in Bosnia today? How many in the US for that matter? We have learned from the evil transgressions of that scumbag fdr.
The Romans built on the history of the Greeks. The US built on the example of the Roman Republic and created something so much superior as to be novel and abiding.
History is learned from and built upon all the time; just not by violent, self-indulgent little boys.