Just a short drive outside of Munich is the small town Dachau, where you’ll find the KZ Dachau Memorial Site. It was the first, and served as a model for other Nazi concentration camps that followed. Not only were prisoners forced into hard labour, they were beaten, murdered, disease-ridden, starved, subject to medical experiments, and many other horrors. You can find out more about the camp here.
If you plan to visit the Memorial Site, be sure to give yourself lots of time. My friend and I had planned to stay there for 2 hours at most. We ended up staying for 4 hours. Take your time, nothing should be missed here.
I left the Memorial feeling I have no right to claim any real suffering in my life.