An emaciated 18-year-old Russian girl looks into the camera lens during the liberation of Dachau concentration camp in 1945. Dachau was the first German concentration camp, opened in 1933. More than 200,000 people were detained between 1933 and 1945, and 31,591 deaths were declared, most from disease, malnutrition and suicide. Unlike Auschwitz, Dachau was not explicitly an extermination camp, but conditions were so horrific that hundreds died every week.

An emaciated 18-year-old Russian girl looks into the camera lens during the liberation of Dachau concentration camp in 1945. Dachau was the first German concentration camp, opened in 1933. More than 200,000 people were detained between 1933 and 1945, and 31,591 deaths were declared, most from disease, malnutrition and suicide. Unlike Auschwitz, Dachau was not explicitly an extermination camp, but conditions were so horrific that hundreds died every week.

It began with a simple boycott of Jewish shops and ended in the gas chambers at Auschwitz as Nazi Germany attempted to exterminate the entire Jewish population of Europe. In January 1933, after a bitter ten-year political struggle, Adolf Hitler came to power in Germany. During his rise to power, Hitler had repeatedly blamed the Jews for Germany’s defeat in World War I and subsequent economic hardships.

Jews at this time composed only about one percent of Germany’s population of 55 million persons. German Jews were mostly cosmopolitan in nature and proudly considered themselves to be Germans by nationality and Jews only by religion. They had lived in Germany for centuries, fought bravely for the Fatherland in its wars and prospered in numerous professions.

But they were gradually shut out of German society by the Nazis through a never-ending series of laws and decrees, culminating in the Nuremberg Laws of 1935 which deprived them of their German citizenship and forbade intermarriage with non-Jews. They were removed from schools, banned from the professions, excluded from military service, and were even forbidden to share a park bench with a non-Jew.

This photo provided by Paris' Holocaust Memorial shows a German soldier shooting a Ukrainian Jew during a mass execution in Vinnytsia, Ukraine, sometime between 1941 and 1943. This image is titled

This photo provided by Paris’ Holocaust Memorial shows a German soldier shooting a Ukrainian Jew during a mass execution in Vinnytsia, Ukraine, sometime between 1941 and 1943. This image is titled “The last Jew in Vinnitsa”, the text that was written on the back of the photograph, which was found in a photo album belonging to a German soldier. Read more about this picture.

In March 1938, Hitler expanded the borders of the Nazi Reich by forcibly annexing Austria. A brutal crackdown immediately began on Austria’s Jews. They also lost everything and were even forced to perform public acts of humiliation such as scrubbing sidewalks clean amid jeering pro-Nazi crowds.

Back in Germany, years of pent-up hatred toward the Jews was finally let loose on the night that marks the actual beginning of the Holocaust. The Night of Broken Glass (Kristallnacht) occurred on November 9/10 after 17-year-old Herschel Grynszpan shot and killed Ernst vom Rath, a German embassy official in Paris, in retaliation for the harsh treatment his Jewish parents had received from Nazis.

Spurred on by Joseph Goebbels, Nazis used the death of vom Rath as an excuse to conduct the first State-run pogrom against Jews. Ninety Jews were killed, 500 synagogues were burned and most Jewish shops had their windows smashed. The first mass arrest of Jews also occurred as over 25,000 men were hauled off to concentration camps.

The Second World War began in September 1939 as German troops stormed into Poland, a country that was home to over three million Jews. After Poland’s quick defeat, Polish Jews were rounded up and forced into newly established ghettos at Lodz, Krakow, and Warsaw, to await future plans. Inside these overcrowded walled-in ghettos, tens of thousands died a slow death from hunger and disease amid squalid living conditions. The ghettos soon came under the jurisdiction of Heinrich Himmler, leader of the Nazi SS, Hitler’s most trusted and loyal organization, composed of fanatical young men.

German soldiers question Jews after the Warsaw Ghetto Uprising in 1943. In October 1940, the Germans began to concentrate Poland's population of over 3 million Jews into overcrowded ghettos. In the largest of these, the Warsaw Ghetto, thousands of Jews died due to rampant disease and starvation, even before the Nazis began their massive deportations from the ghetto to the Treblinka extermination camp. The Warsaw Ghetto Uprising -- the first urban mass rebellion against the Nazi occupation of Europe -- took place from April 19 until May 16 1943, and began after German troops and police entered the ghetto to deport its surviving inhabitants. It ended when the poorly-armed and supplied resistance was crushed by German troops.

German soldiers question Jews after the Warsaw Ghetto Uprising in 1943. In October 1940, the Germans began to concentrate Poland’s population of over 3 million Jews into overcrowded ghettos. In the largest of these, the Warsaw Ghetto, thousands of Jews died due to rampant disease and starvation, even before the Nazis began their massive deportations from the ghetto to the Treblinka extermination camp. The Warsaw Ghetto Uprising — the first urban mass rebellion against the Nazi occupation of Europe — took place from April 19 until May 16 1943, and began after German troops and police entered the ghetto to deport its surviving inhabitants. It ended when the poorly-armed and supplied resistance was crushed by German troops.

In the spring of 1940, Himmler ordered the building of a concentration camp near the Polish city of Oswiecim, renamed Auschwitz by the Germans, to hold Polish prisoners and to provide slave labor for new German-run factories to be built nearby.

Meanwhile, Hitler continued his conquest of Europe, invading Belgium, Holland, Luxembourg and France, placing ever-increasing numbers of Jews under Nazi control. The Nazis then began carefully tallying up the actual figures and also required Jews to register all of their assets. But the overall question remained as to what to do with the millions of Jews now under Nazi control – referred to by the Nazis themselves as the Judenfrage (Jewish question).

The following year, 1941, would be the turning point. In June, Hitler took a tremendous military gamble by invading the Soviet Union. Before the invasion he had summoned his top generals and told them the attack on Russia would be a ruthless “war of annihilation” targeting Communists and Jews and that normal rules of military conflict were to be utterly ignored.

Inside the Soviet Union were an estimated three million Jews, many of whom still lived in tiny isolated villages known as Shtetls. Following behind the invading German armies, four SS special action units known as Einsatzgruppen systematically rounded-up and shot all of the inhabitants of these Shtetls. Sometimes the Einsatz execution squads were aided local anti-Semitic volunteers.

A group of Jews, including a small boy, is escorted from the Warsaw Ghetto by German soldiers in this April 19, 1943 photo. The picture formed part of a report from SS Gen. Stroop to his Commanding Officer, and was introduced as evidence to the War Crimes trials in Nuremberg in 1945.

A group of Jews, including a small boy, is escorted from the Warsaw Ghetto by German soldiers in this April 19, 1943 photo. The picture formed part of a report from SS Gen. Stroop to his Commanding Officer, and was introduced as evidence to the War Crimes trials in Nuremberg in 1945.

During the summer of 1941, SS leader Heinrich Himmler summoned Auschwitz Commandant Rudolf Höss to Berlin and told him: “The Führer has ordered the Final Solution of the Jewish question. We, the SS, have to carry out this order…I have therefore chosen Auschwitz for this purpose”.

At Auschwitz, a large new camp was already under construction to be known as Auschwitz II (Birkenau). This would become the future site of four large gas chambers to be used for mass extermination. The idea of using gas chambers originated during the Euthanasia Program, the so-called “mercy killing” of sick and disabled persons in Germany and Austria by Nazi doctors.

By now, experimental mobile gas vans were being used by the Einsatzgruppen to kill Jews in Russia. Special trucks had been converted by the SS into portable gas chambers. Jews were locked up in the air-tight rear container while exhaust fumes from the truck’s engine were fed in to suffocate them. However, this method was found to be somewhat impractical since the average capacity was less than 50 persons. For the time being, the quickest killing method continued to be mass shootings. And as Hitler’s troops advanced deep into the Soviet Union, the pace of Einsatz killings accelerated. Over 33,000 Jews in the Ukraine were shot in the Babi Yar ravine near Kiev during two days in September 1941.

The next year, 1942, marked the beginning of mass murder on a scale unprecedented in all of human history. In January, fifteen top Nazis led by Reinhard Heydrich, second in command of the SS, convened the Wannsee Conference in Berlin to coordinate plans for the Final Solution. The Jews of Europe would now be rounded up and deported into occupied Poland where new extermination centers were being constructed at Belzec, Sobibor, Treblinka, and Auschwitz-Birkenau. Code named “Aktion Reinhard” in honor of Heydrich, the Final Solution began in the spring as over two million Jews already in Poland were sent to be gassed as soon as the new camps became operational.

After the Warsaw Ghetto Uprising, the Ghetto was completely destroyed. Of the more than 56,000 Jews captured, about 7,000 were shot, and the remainder were deported to killing centers or concentration camps. This is a view of the remains of the ghetto, which the German SS dynamited to the ground. The Warsaw Ghetto only existed for a few years, and in that time, some 300,000 Polish Jews lost their lives there.

After the Warsaw Ghetto Uprising, the Ghetto was completely destroyed. Of the more than 56,000 Jews captured, about 7,000 were shot, and the remainder were deported to killing centers or concentration camps. This is a view of the remains of the ghetto, which the German SS dynamited to the ground. The Warsaw Ghetto only existed for a few years, and in that time, some 300,000 Polish Jews lost their lives there.

Every detail of the actual extermination process was meticulously planned. Jews arriving in trains at Belzec, Sobibor, and Treblinka were falsely informed by the SS that they had come to a transit stop and would be moving on to their true destination after delousing. They were told their clothes were going to be disinfected and that they would all be taken to shower rooms for a good washing. Men were then split up from the women and children. Everyone was taken to undressing barracks and told to remove all of their clothing.

Women and girls next had their hair cut off. First the men, and then the women and children, were hustled in the nude along a narrow fenced-in pathway nicknamed by the SS as the Himmelstrasse (road to Heaven). At the end of the path was a bathhouse with tiled shower rooms. As soon as the people were all crammed inside, the main door was slammed shut, creating an air-tight seal. Deadly carbon monoxide fumes were then fed in from a stationary diesel engine located outside the chamber.

At Auschwitz-Birkenau, new arrivals were told to carefully hang their clothing on numbered hooks in the undressing room and were instructed to remember the numbers for later. They were given a piece of soap and taken into the adjacent gas chamber disguised as a large shower room. In place of carbon monoxide, pellets of the commercial pesticide Zyklon-B (prussic acid) were poured into openings located above the chamber.

The gas pellets fell into hollow shafts made of perforated sheet metal and vaporized upon contact with air, giving off lethal cyanide fumes inside the chamber which oozed out at floor level then rose up toward the ceiling. Children died first since they were closer to the floor. Pandemonium usually erupted as the bitter almond-like odor of the gas spread upwards with adults climbing on top of each other forming a tangled heap of dead bodies all the way up to the ceiling.

A German in a military uniform shoots at a Jewish woman after a mass execution in Mizocz, Ukraine. In October of 1942, the 1,700 people in the Mizocz ghetto fought with Ukrainian auxiliaries and German policemen who had intended to liquidate the population. About half the residents were able to flee or hide during the confusion before the uprising was finally put down. The captured survivors were taken to a ravine and shot. Photo provided by Paris' Holocaust Memorial.

A German in a military uniform shoots at a Jewish woman after a mass execution in Mizocz, Ukraine. In October of 1942, the 1,700 people in the Mizocz ghetto fought with Ukrainian auxiliaries and German policemen who had intended to liquidate the population. About half the residents were able to flee or hide during the confusion before the uprising was finally put down. The captured survivors were taken to a ravine and shot. Photo provided by Paris’ Holocaust Memorial.

At each of the death camps, special squads of Jewish slave laborers called Sonderkommandos were utilized to untangle the victims and remove them from the gas chamber. Next they extracted any gold fillings from teeth and searched body orifices for hidden valuables. The corpses were disposed of by various methods including mass burials, cremation in open fire pits or in specially designed crematory ovens such as those used at Auschwitz. All clothing, money, gold, jewelry, watches, eyeglasses and other valuables were sorted out then shipped back to Germany for re-use. Women’s hair was sent to a firm in Bavaria for the manufacture of felt.

Although the Nazis attempted to keep all of the death camps secret, rumors and some eyewitness reports gradually filtered out. Harder to conceal were the mass shootings occurring throughout occupied Russia. On June 30 and July 2, 1942, the New York Times reported via the London Daily Telegraph that over 1,000,000 Jews had already been shot.

That summer, Swiss representatives of the World Jewish Congress received information from a German industrialist regarding the Nazi plan to exterminate the Jews. They passed the information on to London and Washington. In December 1942, British Foreign Secretary Anthony Eden stood before the House of Commons and declared the Nazis were “now carrying into effect Hitler’s oft-repeated intention to exterminate the Jewish people of Europe.”

Jews in America responded to the various reports by holding a rally at New York’s Madison Square Garden in March 1943 to pressure the U.S. government into action. As a result, the Bermuda Conference was held from April 19-30, with representatives from the U.S. and Britain meeting to discuss the problem of refugees from Nazi-occupied countries. But the meeting resulted in complete inaction concerning the ongoing exterminations.

Jewish deportees in the Drancy transit camp near Paris, France, in 1942, on their last stop before the German concentration camps. Some 13,152 Jews (including 4,115 children) were rounded up by French police forces, taken from their homes to the

Jewish deportees in the Drancy transit camp near Paris, France, in 1942, on their last stop before the German concentration camps. Some 13,152 Jews (including 4,115 children) were rounded up by French police forces, taken from their homes to the “Vel d’Hiv”, or winter cycling stadium in southwestern Paris, in July of 1942. They were later taken to a rail terminal at Drancy, northeast of the French capital, and then deported to the east. Only a handful ever returned.

By 1944, the tide of war had turned against Hitler and his armies were being defeated on all fronts by the Allies. However, the killing of Jews continued uninterrupted. Railroad locomotives and freight cars badly needed by the German Army were instead used by the SS to transport Jews to Auschwitz.

In May, Nazis under the direction of SS Lt. Colonel Adolf Eichmann boldly began a mass deportation of the last major surviving population of European Jews. From May 15 to July 9, over 430,000 Hungarian Jews were deported to Auschwitz. During this time, Auschwitz recorded its highest-ever daily number of persons killed and cremated at just over 9000. Six huge open pits were used to burn the bodies, as the number of dead exceeded the capacity of the crematories.

The unstoppable Allied military advance continued and on July 24, 1944, Soviet troops liberated the first camp, Majdanek in eastern Poland, where over 360,000 had died. As the Soviet Army neared Auschwitz, Himmler ordered the complete destruction of the gas chambers. Throughout Hitler’s crumbling Reich, the SS now began conducting death marches of surviving concentration camp inmates away from outlying areas, including some 66,000 from Auschwitz. Most of the inmates on these marches either dropped dead from exertion or were shot by the SS when they failed to keep up with the column.

The Soviet Army reached Auschwitz on January 27, 1945. By that time, an estimated 1,500,000 Jews, along with 500,000 Polish prisoners, Soviet POWs and Gypsies, had perished there. As the Western Allies pushed into Germany in the spring of 1945, they liberated Buchenwald, Bergen-Belsen, and Dachau. Now the full horror of the twelve-year Nazi regime became apparent as British and American soldiers, including Supreme Commander Dwight D. Eisenhower, viewed piles of emaciated corpses and listened to vivid accounts given by survivors.

Anne Frank poses in 1941 in this photo made available by Anne Frank House in Amsterdam, Netherlands. In August of 1944, Anne, her family and others who were hiding from the occupying German Security forces, were all captured and shipped off to a series of prisons and concentration camps. Anne died from typhus at age 15 in Bergen-Belsen concentration camp, but her posthumously published diary has made her a symbol of all Jews killed in World War II.

Anne Frank poses in 1941 in this photo made available by Anne Frank House in Amsterdam, Netherlands. In August of 1944, Anne, her family and others who were hiding from the occupying German Security forces, were all captured and shipped off to a series of prisons and concentration camps. Anne died from typhus at age 15 in Bergen-Belsen concentration camp, but her posthumously published diary has made her a symbol of all Jews killed in World War II.

The arrival and processing of an entire transport of Jews from Carpatho-Ruthenia, a region annexed in 1939 to Hungary from Czechoslovakia, at Auschwitz-Birkenau extermination camp in Poland, in May of 1944. The picture was donated to Yad Vashem in 1980 by Lili Jacob.

The arrival and processing of an entire transport of Jews from Carpatho-Ruthenia, a region annexed in 1939 to Hungary from Czechoslovakia, at Auschwitz-Birkenau extermination camp in Poland, in May of 1944. The picture was donated to Yad Vashem in 1980 by Lili Jacob.

Czeslawa Kwoka, age 14, appears in a prisoner identity photo provided by the Auschwitz Museum, taken by Wilhelm Brasse while working in the photography department at Auschwitz, the Nazi-run death camp where some 1.5 million people, most of them Jewish, died during World War II. Czeslawa was a Polish Catholic girl, from Wolka Zlojecka, Poland, who was sent to Auschwitz with her mother in December of 1942. Within three months, both were dead. Photographer (and fellow prisoner) Brasse recalled photographing Czeslawa in a 2005 documentary:

Czeslawa Kwoka, age 14, appears in a prisoner identity photo provided by the Auschwitz Museum, taken by Wilhelm Brasse while working in the photography department at Auschwitz, the Nazi-run death camp where some 1.5 million people, most of them Jewish, died during World War II. Czeslawa was a Polish Catholic girl, from Wolka Zlojecka, Poland, who was sent to Auschwitz with her mother in December of 1942. Within three months, both were dead. Photographer (and fellow prisoner) Brasse recalled photographing Czeslawa in a 2005 documentary: “She was so young and so terrified. The girl didn’t understand why she was there and she couldn’t understand what was being said to her. So this woman Kapo (a prisoner overseer) took a stick and beat her about the face. This German woman was just taking out her anger on the girl. Such a beautiful young girl, so innocent. She cried but she could do nothing. Before the photograph was taken, the girl dried her tears and the blood from the cut on her lip. To tell you the truth, I felt as if I was being hit myself but I couldn’t interfere. It would have been fatal for me”. Read more about this picture.

A victim of Nazi medical experimentation. A victim's arm shows a deep burn from phosphorus at Ravensbrueck, Germany, in November of 1943. The photograph shows the results of a medical experiment dealing with phosphorous that was carried out by doctors at Ravensbrueck. In the experiment, a mixture of phosphorus and rubber was applied to the skin and ignited. After twenty seconds, the fire was extinguished with water. After three days, the burn was treated with Echinacin in liquid form. After two weeks the wound had healed. This photograph, taken by a camp physician, was entered as evidence during the Doctors Trial at Nuremberg.

A victim of Nazi medical experimentation. A victim’s arm shows a deep burn from phosphorus at Ravensbrueck, Germany, in November of 1943. The photograph shows the results of a medical experiment dealing with phosphorous that was carried out by doctors at Ravensbrueck. In the experiment, a mixture of phosphorus and rubber was applied to the skin and ignited. After twenty seconds, the fire was extinguished with water. After three days, the burn was treated with Echinacin in liquid form. After two weeks the wound had healed. This photograph, taken by a camp physician, was entered as evidence during the Doctors Trial at Nuremberg.

A U.S. soldier inspects thousands of gold wedding bands taken from Jews by the Germans and stashed in the Heilbronn Salt Mines, on May 3, 1945 in Germany.

A U.S. soldier inspects thousands of gold wedding bands taken from Jews by the Germans and stashed in the Heilbronn Salt Mines, on May 3, 1945 in Germany.

Three U.S. soldiers look at bodies stuffed into an oven in a crematorium in April of 1945. Photo taken in an unidentified concentration camp in Germany, at time of liberation by U.S. Army.

Three U.S. soldiers look at bodies stuffed into an oven in a crematorium in April of 1945. Photo taken in an unidentified concentration camp in Germany, at time of liberation by U.S. Army.

Prisoners at the electric fence of Dachau concentration camp cheer American soldiers in Dachau, Germany in an undated photo. Some of them wear the striped blue and white prison garb. They decorated their huts with flags of all nations which they had made secretly as they heard the guns of the 42nd Rainbow Division getting louder and louder on the approach to Dachau.

Prisoners at the electric fence of Dachau concentration camp cheer American soldiers in Dachau, Germany in an undated photo. Some of them wear the striped blue and white prison garb. They decorated their huts with flags of all nations which they had made secretly as they heard the guns of the 42nd Rainbow Division getting louder and louder on the approach to Dachau.

Prisoners on a death march from Dachau move towards the south along the Noerdliche Muenchner Street in Gruenwald, Germany, on April 29, 1945. Many thousands of prisoners were marched forcibly from outlying prison camps to camps deeper inside Germany as Allied forces closed in. Thousands died along the way, anyone unable to keep up was executed on the spot. Pictured, fourth from the right, is Dimitry Gorky who was born on August 19, 1920 in Blagoslovskoe, Russia to a family of peasant farmers. During World War II Dmitry was imprisoned in Dachau for 22 months. The reason for his imprisonment is not known. Photo released by the U.S. Holocaust Memorial Museum

Prisoners on a death march from Dachau move towards the south along the Noerdliche Muenchner Street in Gruenwald, Germany, on April 29, 1945. Many thousands of prisoners were marched forcibly from outlying prison camps to camps deeper inside Germany as Allied forces closed in. Thousands died along the way, anyone unable to keep up was executed on the spot. Pictured, fourth from the right, is Dimitry Gorky who was born on August 19, 1920 in Blagoslovskoe, Russia to a family of peasant farmers. During World War II Dmitry was imprisoned in Dachau for 22 months. The reason for his imprisonment is not known. Photo released by the U.S. Holocaust Memorial Museum

When American troops liberated prisoners in the Dachau concentration camp, Germany, in 1945, many German SS guards were killed by the prisoners who then threw their bodies into the moat surrounding the camp.

When American troops liberated prisoners in the Dachau concentration camp, Germany, in 1945, many German SS guards were killed by the prisoners who then threw their bodies into the moat surrounding the camp.

Starved prisoners, nearly dead from hunger, pose in a concentration camp in Ebensee, Austria, on May 7, 1945. The camp was reputedly used for

Starved prisoners, nearly dead from hunger, pose in a concentration camp in Ebensee, Austria, on May 7, 1945. The camp was reputedly used for “scientific” experiments.

A Russian survivor, liberated by the 3rd Armored Division of the U.S. First Army, identifies a former camp guard who brutally beat prisoners on April 14, 1945, at the Buchenwald concentration camp in Thuringia, Germany.

A Russian survivor, liberated by the 3rd Armored Division of the U.S. First Army, identifies a former camp guard who brutally beat prisoners on April 14, 1945, at the Buchenwald concentration camp in Thuringia, Germany. Read more about this picture.

Manacled following his arrest is Joseph Kramer, commandant of the Bergen-Belsen concentration camp in Belsen, photographed on April 28, 1945. After standing trial, Kramer,

Manacled following his arrest is Joseph Kramer, commandant of the Bergen-Belsen concentration camp in Belsen, photographed on April 28, 1945. After standing trial, Kramer, “The Beast of Belsen”, was convicted and executed in December of 1945.