No, but my Dad takes groups of students to Auschwitz every year. I've seen Oradour Sur Glane, which is not a POW camp, but has the same kind of macabre fascination.
I think most people go because it's a physical connection to something they can't even conceive of, but that is so close to human nature, and only just under the surface of civilisation. It turns it from 'those nasty Germans' into 'this is us'. We've all seen the kinds of behaviour that under different political and economic situations could lead to dehumanisation of a population - the existence of the BNP and the 'I hate dem muslamists' crowd, but also a certain type of chilling efficiency with which human lives can be reduced to numbers.
The Final Solution was decided by men in suits in a board room. Going from reading a history book to seeing the physical block where somebody was forced to sleep before being killed just brings home the fact that in another life your manager at work could quite easily be a mass murderer.