We did dachu camp first, then on to auschwitz, then to colditz castle, we had a great trip.
I don't think I could ever describe visting former death camps and now more aptly named memorials as a great trip. Informative yes but never great.
Like you our first visit was to Dachu. I came away with more questions than answers, since then we have visited Auschwitz twice, Sachsenhausen near Berlin, Belsen-Bergen north of Hannover. Mauthausen in Austria.
In two weeks time we'll be going Prague and Dresden, and so we'll be stopping off to pay our respects at Theresienstadt at Terezin north of Prague, and at Buchenwald and Mittelbau-Dora on way back from Dresden.