Short, and very sad - Dachau:

Fairly innocuous entry gate

"Work will set you free" - the first lie upon entering

The prison was about 10 times this big - these are barracks foundations, that's the crematorium in the background

Scale model of the prison

Monument to the victims

The atrocity referenced in "The Reader"

The network of prisons just in Bavaria - they were built in impoverished rural areas that 'needed jobs'

All the European prisons

This is just a glimpse of what we saw.  The museum is huge, and information is overwhelming.  Credit to the Krauts for making it a primary part of the history curriculum in their schools.  

If you get to D.C. go to the Holocaust Museum, if you can bear it.