One of the exhibitions, "Never Forget: Visions of the Nazi Camps" is filled with photographs taken in and of the camps, Survivor stories, postal artifacts and archival film taken by the U.S. Army during Liberation.
Such film clips include the liberation of Arnstadt, Auschwitz-Birkenau, Bergen-Belsen, Breendonck, Buchenwald (and two of its subcamps Ohrdruf and Penig), Dachau, Flossenburg, Hadamar, Hannover, Mathausen (and Gunskirchen, a subcamp), and Nordhausen.
You can also see what instructions were given to camp 'inmates' and others for what was allowed to be said and sent when corresponding.
More will be posted soon on this blog, discussing the many postal artifacts that are now part of this exhibition.
Within this exhibition you should use the list of links provided to access the material on display about any of the camps mentioned, or just follow the "next" links at the bottom of each page. You can find the aforementioned exhibition here.