In early 1937, the SS, using prisoner labor, began construction of a large complex of buildings on the grounds of the original camp. Prisoners were forced to do this work, starting with the destruction of the old munitions factory, under terrible conditions. The construction was officially completed in mid-August 1938 and the camp remained essentially unchanged until 1945. Dachau thus remained in operation for the entire period of the Third Reich.

With this police infrastructure in place, opponents of the Nazis were terrorized, beaten, or sent to one of the concentration camps the Germans built to incarcerate them. Dachau, just outside of Munich, was the first such camp built for political prisoners. Dachau's purpose changed over time and eventually became another brutal concentration camp for Jews.
Thus although the Nazi 'Final Solution' was one genocide among many, it had features that made it stand out from all the rest as well. Unlike all the others it was bounded neither by space nor by time. It was launched not against a local or regional obstacle, but at a world-enemy seen as operating on a global scale. It was bound to an even larger plan of racial reordering and reconstruction involving further genocidal killing on an almost unimaginable scale, aimed, however, at clearing the way in a particular region – Eastern Europe – for a further struggle against the Jews and those the Nazis regarded as their puppets. It was set in motion by ideologues who saw world history in racial terms. It was, in part, carried out by industrial methods. These things all make it unique.
^ Nazi Science – The Dachau Hypothermia Experiments. Robert L. Berger, N Engl J Med 1990; 322:1435–1440 May 17, 1990 DOI: 10.1056/NEJM199005173222006. quote: "On analysis, the Dachau hypothermia study has all the ingredients of a scientific fraud, and rejection of the data on purely scientific grounds is inevitable. They cannot advance science or save human lives." ... "Future citations are inappropriate on scientific grounds."
At this point, we must remember that some survivors were unable to return to "normal" life after the trauma of the Holocaust. Among this group were survivors who committed suicide, survivors who experienced severe psychological scarring, survivors who were unable to marry or have children, and others who suffered from a host of problems after the Holocaust. What is remarkable is that these were the minority, and that most Holocaust survivors were able to bring a certain degree of order to their chaotic world.

In town there are still parts of the Schleißheimer canal remaining today. This canal was built in the mid-eighteenth century as part of the northern Munich canal system to which the Nymphenburger Canal belongs as well. It functioned as a transportation route between Dachau and Schleißheim. The building material recovered from the demolition of three wings of the Dachau castle was transported to Schleißheim this way.

The story of the negotiations is curious. Two German officers presented themselves before the British outposts and explained that there were 9,000 sick in the camp and that all sanitation had failed. They proposed that the British should occupy the camp at once, as the responsibility was international in the interests of health. In return for the delay caused by the truce the Germans offered to surrender intact the bridges over the river Aller. After brief consideration the British senior officer rejected the German proposals, saying it was necessary that the British should occupy an area of ten kilometers round the camp in order to be sure of keeping their troops and lines of communication away from the disease. The British eventually took over the camp.
While there were only 23 main camps between 1933 to 1945, the Nazi regime established some 20,000 other camps used for forced labor, transit or temporary internment. During the Holocaust it is estimated that 6 million Jews were slaughtered along with, 3 million Soviet prisoners of war, 3 million Polish Catholics, 700,000 Serbians, 250,000 Gypsies, Sinti, and Lalleri, 80,000 Germans (for political reasons), 70,000 German handicapped, 12,000 homosexuals, and 2,500 Jehovah’s Witnesses.

The Bergen Belsen concentration camp was established in April 1943. Over the next year-and-a-half, five sub-camps were set up there. Jewish inmates of these camps were forced to perform hard labor for the Nazis. Bergen Belsen was infamous for its extremely unhygienic conditions; it was infested with lice and typhus. Its horrific conditions deteriorated near the end of the war, when tens of thousands of prisoners arrived at Bergen Belsen on death marches from the East.
On 26 April 1945 prisoner Karl Riemer fled the Dachau concentration camp to get help from American troops and on 28 April Victor Maurer, a representative of the International Red Cross, negotiated an agreement to surrender the camp to U.S. troops. That night a secretly formed International Prisoners Committee took over the control of the camp. Units of 3rd Battalion, 157th Infantry Regiment, 45th Infantry Division, commanded by Lieutenant Colonel Felix L. Sparks, were ordered to secure the camp. On 29 April Sparks led part of his battalion as they entered the camp over a side wall.[76] At about the same time, Brigadier General Henning Linden led the 222nd Infantry Regiment of the 42nd (Rainbow) Infantry Division soldiers including his aide, Lieutenant William Cowling,[77] to accept the formal surrender of the camp from German Lieutenant Heinrich Wicker at an entrance between the camp and the compound for the SS garrison. Linden was traveling with Marguerite Higgins and other reporters, as a result, Linden's detachment generated international headlines by accepting the surrender of the camp. More than 30,000 Jews and political prisoners were freed, and since 1945 adherents of the 42nd and 45th Division versions of events have argued over which unit was the first to liberate Dachau.[30]:201[78]:283[79][80][81]
Almost all Jews within areas occupied by the Germans were killed. There were 3,020,000 Jews in the Soviet Union in 1939, and the losses were 1–1.1 million.[400] Around one million Jews were killed by the Einsatzgruppen in the occupied Soviet territories.[401][402] Of Poland's 3.3 million Jews, about 90 percent were killed.[369] Many more died in the ghettos of Poland before they could be deported.[403] The death camps accounted for half the number of Jews killed; 80–90 percent of death-camp victims are estimated to have been Jews.[394] At Auschwitz-Birkenau the Jewish death toll was 1.1 million;[286][404] Treblinka 870,000–925,000;[405] Bełżec 434,000–600,000;[406][287] Chełmno 152,000–320,000;[407][288] Sobibór 170,000–250,000;[408][291] and Majdanek 79,000.[289]
According to testimony given at the Nuremberg IMT, approximately 150 Dachau inmates were forced to participate in medical experiments conducted by Dr. Sigmund Rascher for the German Air Force, and about half of them died as a result. The subjects for these experiments were allegedly German "professional criminals" and Soviet POWs who were Communist Commissars, sentenced to be executed on the orders of Adolf Hitler. One Jew, who had been condemned to death for breaking the law against race mixing, was used in these experiments.
The camp was divided into eight sections: a detention camp, two women's camps, a special camp, neutrals camp, "star" camp, Hungarian camp and a tent camp. Polish Jews with citizenship papers from foreign countries lived in the special camp. The detention camp held prisoners brought from other camps to construct Bergen-Belsen. Approximately 4,000 Jewish prisoners, primarily Dutch, lived in the "Star" camp, so named because the prisoners wore the Star of David on their clothing instead of camp uniforms. The Hungarian camp housed more than 1,600 Hungarian Jews. The tent camp housed the overflow of sick, debilitated female prisoners from the hospital camp. Bergen-Belsen's most famous prisoners-Anne Frank and her sister Margo-lived in the tent camp.
In the fall of that year the Płaszów work camp opened nearby, and by February 1943 it was under the command of the notoriously sadistic SS officer Amon Göth, who would be executed after the war. Capitalizing on the officer’s appetite for drink and other luxury items available mainly on the black market, Schindler cultivated his friendship by ensuring a constant stream of them to the villa from which he oversaw the camp. Schindler thus managed to prevail upon Göth to create a separate camp for his Jewish workers, where they were free of the abuses suffered at Płaszów. Though Schindler’s motivations prior to this point are unclear, many scholars interpret his efforts to extricate his workers from Płaszów as indication that his concern for them was not purely financial.
Despite, wide reporting of Holocaust atrocities including gas chambers, many prominent analysts doubted the authenticity of these reports. Prominently, Roger Allen, a member of the British Foreign Office discounted intelligence reports on the use of gas chambers in Polish extermination camps because he could “never understand what the advantage of a gas chamber over a simple machine gun or over starving people would be.”
Another 350 suffered the same fate in early 1944, this left 350 detainees in the camp, of whom 266 were in possession of immigration permits to Palestine, 34 were United States citizens and 50 had South American papers. These prisoners were not assigned to work teams and no contact was permitted between them and other groups of Bergen- Belsen prisoners.
“ ...Here over an acre of ground lay dead and dying people. You could not see which was which... The living lay with their heads against the corpses and around them moved the awful, ghostly procession of emaciated, aimless people, with nothing to do and with no hope of life, unable to move out of your way, unable to look at the terrible sights around them ... Babies had been born here, tiny wizened things that could not live ... A mother, driven mad, screamed at a British sentry to give her milk for her child, and thrust the tiny mite into his arms, then ran off, crying terribly. He opened the bundle and found the baby had been dead for days.