Completely agree...the corridors with all the photos, just the scale of it all. Frightening what man is actually capable of. I visited Tallinn the other week and visited former prison cells underneath what are now apartments, and a tour of the top floor of a hotel that housed the KGB spying on guests. Have to feel for the Estonians, Russian terror, Nazi terror, more Russian terror.
Don't miss the beer house on florianska good food and beer very cheap. I found Auschwitz birkenau very tough but glad I went.