Wow. Dachau was an incredible experience. It doesn't matter how much you read or learn about the Holocaust, WWII or the concentrations camps, nothing prepares you for visiting a camp. The level of meticulous planning was both impressive and horrific.
At Dachau, you can go into all of the buildings, many original. We went into the prison cells, gas chambers, holding areas, crematorium, and sleeping barracks. The emotions you feel while visiting are numerous. If you get the chance, visit Dachau. It allows you to remember the victims and learn from the past.