The Auschwitz Birkenau camp complex comprises 155 brick and wooden structures (57 in Auschwitz and 98 in Birkenau) and about 300 ruins. There are also ruins of gas chambers and crematoria in Birkenau, which were dynamited in January 1945. The overall length of fencing supported by concrete poles is more than 13 km. Individual structures of high historical significance, such as railway sidings and ramps, food stores and industrial buildings, are dispersed in the immediate setting of the property. These structures, along with traces in the landscape, remain poignant testimonies to this tragic history.
Hitler's first DAP speech was held in the Hofbräukeller on 16 October 1919. He was the second speaker of the evening, and spoke to 111 people.[43] Hitler later declared that this was when he realised he could really "make a good speech".[30] At first, Hitler spoke only to relatively small groups, but his considerable oratory and propaganda skills were appreciated by the party leadership. With the support of Anton Drexler, Hitler became chief of propaganda for the party in early 1920.[44] Hitler began to make the party more public, and organised its biggest meeting yet of 2,000 people on 24 February 1920 in the Staatliches Hofbräuhaus in München. Such was the significance of this particular move in publicity that Karl Harrer resigned from the party in disagreement.[45] It was in this speech that Hitler enunciated the twenty-five points of the German Workers' Party manifesto that had been drawn up by Drexler, Feder and himself.[46] Through these points he gave the organisation a much bolder stratagem[44] with a clear foreign policy (abrogation of the Treaty of Versailles, a Greater Germany, Eastern expansion and exclusion of Jews from citizenship) and among his specific points were: confiscation of war profits, abolition of unearned incomes, the State to share profits of land and land for national needs to be taken away without compensation.[47] In general, the manifesto was antisemitic, anti-capitalist, anti-democratic, anti-Marxist and anti-liberal.[48] To increase its appeal to larger segments of the population, on the same day as Hitler's Hofbräuhaus speech on 24 February 1920, the DAP changed its name to the Nationalsozialistische Deutsche Arbeiterpartei ("National Socialist German Workers' Party", or Nazi Party).[49][50] The word "Socialist" was added by the party's executive committee, over Hitler's objections, in order to help appeal to left-wing workers.[51]
With Hitler's approval, Himmler intended that the new society of the Nazi regime should destigmatise illegitimate births, particularly of children fathered by members of the SS, who were vetted for racial purity.[385] His hope was that each SS family would have between four and six children.[385] The Lebensborn (Fountain of Life) association, founded by Himmler in 1935, created a series of maternity homes to accommodate single mothers during their pregnancies.[386] Both parents were examined for racial suitability before acceptance.[386] The resulting children were often adopted into SS families.[386] The homes were also made available to the wives of SS and NSDAP members, who quickly filled over half the available spots.[387]

The Germans established a camp at Drancy, northeast of Paris, in August 1941 as an internment camp for foreign Jews in France. It then became the major transit camp for the deportation of Jews from France. Initially, French police under the control of the German Security Service administered Drancy. Then, in July 1943, the Germans took over the running of the camp.
Action T4 was a programme of systematic murder of the physically and mentally handicapped and patients in psychiatric hospitals that took place mainly from 1939 to 1941, and continued until the end of the war. Initially the victims were shot by the Einsatzgruppen and others; gas chambers and gas vans using carbon monoxide were used by early 1940.[312][313] Under the Law for the Prevention of Hereditarily Diseased Offspring, enacted on 14 July 1933, over 400,000 individuals underwent compulsory sterilisation.[314] Over half were those considered mentally deficient, which included not only people who scored poorly on intelligence tests, but those who deviated from expected standards of behaviour regarding thrift, sexual behaviour, and cleanliness. Most of the victims came from disadvantaged groups such as prostitutes, the poor, the homeless, and criminals.[315] Other groups persecuted and killed included Jehovah's Witnesses, homosexuals, social misfits, and members of the political and religious opposition.[186][316]
When a mother did not want to be separated from her thirteen-year-old daughter, and bit and scratched the face of the SS man who tried to force her to her assigned line, Mengele drew his gun and shot both the woman and the child. As a blanket punishment, he sent to the gas chamber all people from that transport who had previously been selected for work, with the comment: Away with this shit! 
No one knows better than you yourself, my Führer, that you were never the seventh member of the party, but at best the seventh member of the committee... And a few years ago I had to complain to a party office that your first proper membership card of the DAP, bearing the signatures of Schüssler and myself, was falsified, with the number 555 being erased and number 7 entered.[42]

Hitler found this common denominator in the Jews, whom he identified with both Bolshevism and a kind of cosmic evil. The Jews were to be discriminated against not according to their religion but according to their “race.” Nazism declared the Jews—whatever their educational and social development—to be forever fundamentally different from and inimical to Germans.
By 1940, the CCI came under the control of the Verwaltung und Wirtschaftshauptamt Hauptamt (VuWHA; Administration and Business office) which was set up under Oswald Pohl.[25] Then in 1942, the CCI became Amt D (Office D) of the consolidated main office known as the SS-Wirtschafts-Verwaltungshauptamt (SS Economic and Administrative Department; WVHA) under Pohl.[25] In 1942, the SS built a network of extermination camps to systematically kill millions of prisoners by gassing. The extermination camps (Vernichtungslager) and death camps (Todeslager) were camps whose primary function was genocide. The Nazis themselves distinguished the concentration camps from the extermination camps.[26][27] The British intelligence service had information about the concentration camps, and in 1942 Jan Karski delivered a thorough eyewitness account to the government.