This is a visit that all people, if you ever have the opportunity, should do. Check "in situ" how, where and why one of the greatest human atrocities committed happened, it is an unforgettable lesson. The Germans are ensuring that the Nazi atrocities aren't forgotten, it is the best way to not repeat them. We did the tour with the kids in freetour and it was a pleasure. The concentration camp (not extermination) is located 35 km from Berlin. Can be reached by metro ticket (zones ABC) in half an hour. From Oranienburg station must walk for about 10 minutes to the park. Total time of the trip about five hours.