By summer 1942, Auschwitz concentration camp was expanded to accommodate large numbers of deportees for killing or enslavement.
Hitler did not speak publicly about the killings, and seems never to have visited the concentration camps.
Source: Wikipedia
SS General Hans Kammler, who as an engineer had constructed several concentration camps, including Auschwitz, had a reputation for brutality and had originated the idea of using concentration camp prisoners as slave laborers in the Wernher von Braun's rocket program. Arthur Rudolph, chief engineer of the V-2 rocket factory at Peenemünde, endorsed this idea in April 1943 when a labor shortage developed. More people died building the V-2 rockets than were killed by it as a weapon.
Source: Wikipedia
On 3 September 1944, the group including Anne Frank was deported on what would be the last transport from Westerbork to the Auschwitz concentration camp and arrived after a three-day journey. Upon arrival at Auschwitz, the SS forcibly separated the men from the women and children, and Otto Frank was wrenched from his family. Those deemed able to work were admitted into the camp, and those deemed unfit for labour were immediately killed. Of the 1,019 passengers, 549—including all children younger than 15—were sent directly to the gas chambers. Anne Frank, who had turned 15 three months earlier, was one of the youngest people spared from her transport. She was soon made aware that most people were gassed upon arrival and never learned that the entire group from the Achterhuis had survived this selection. She reasoned that her father, in his mid-fifties and not particularly robust, had been killed immediately after they were separated.
Source: Wikipedia
In 1979 John Paul II visited the Auschwitz concentration camp in Poland, where many of his compatriots (mostly Jews) had perished during the Nazi occupation in World War II, the first pope to do so.
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On Heinrich Himmler's orders, by early 1942 the camp at Auschwitz had been greatly expanded, including the addition of gas chambers, where victims were killed using the pesticide Zyklon B.
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In March 1944, Adolf Eichmann oversaw the deportation of much of the Jewish population. Most of the victims were sent to Auschwitz concentration camp, where about 75 per cent were murdered upon arrival.
Source: Wikipedia