"They said two things: 'we couldn't do anything about it' and 'we didn't know anything about all this.' Both are lies." The NS-DOK Museum in Cologne is dedicated to the darkest time in German history. Here they keep the memory of the victims of Nazism, but not only. With names and photos, the museum also presents those criminals who managed to escape punishment after the war. Such memorials are needed in every country that has survived a dictatorship, according to the museum