Photos:: Auschwitz, 70 years after liberation

German President Joachim Gauck, left, puts a candle on a memorial for Auschwitz victims.  (Janek Skarzynki / AFP/Getty Images)

A giant screen displays a picture of a Holocaust survivor as survivors and dignitaries sit in a tent erected in front of the entrance of the former Nazi concentration camp Auschwitz-Birkenau during the main ceremony to mark the 70th anniversary of the liberation of the death camp on January 27, 2015 in Oswiecim, Poland.  (ODD ANDERSEN / AFP/Getty Images)

Auschwitz survivor Michal Habas, left, attends the main remembrence of the 70th anniversary of the liberation of the Nazi concentration camp Auschwitz-Birkenau.  (JACEK BEDNARCZYK / EPA)

Auschwitz survivor Miroslaw Celka walks out the gate with the sign saying “Work makes you free” after paying tribute to fallen comrades at the “death wall” execution spot in the former Auschwitz-Birkenau concentration camp in Oswiecim, Poland.  (ODD ANDERSEN / AFP/Getty Images)

A watch tower stands along a barbed wire fence at the site of the former Auschwitz-Birkenau concentration camp on the eve of the 70th anniversary of the liberation of the Nazi death camp in Oswiecim, Poland.  (ODD ANDERSEN / AFP/Getty Images)

The gate to the Auschwitz-Birkenau death camp still stands with the words “Arbeit macht frei” (“Work makes you free”) in Oswiecim, Poland.  (Joel Saget / AFP/Getty Images)

A barbed wire fence surrounds the former Nazi concentration camp in Oswiecim, Poland. Events will be held to mark the 70th anniversary of its liberation.  (Sean Gallup / Getty Images)

A watchtower still stands at the site of the former Nazi death camp, which was liberated by the Soviet army on Jan. 27, 1945.   (Joel Saget / AFP/Getty Images)

At the Auschwitz-Birkenau Memorial and Museum, a photograph taken clandestinely by a prisoner in summer 1944 shows the bodies of prisoners being burned next to crematorium V.  (Joel Saget / AFP/Getty Images)

Visitors walk between detention buildings at Auschwitz. A decade ago, 1,500 Holocaust survivors traveled to the death camp to mark the 60th anniversary of its liberation. This year, organizers expect 300 survivors to attend, the youngest in their 70s.   (Alik Keplicz / Associated Press)

Visitors walk between barbed wire fences at the Nazi death camp in Oswiecim, Poland. The aged sign warns of an electrified fence.   (Alik Keplicz / Associated Press)

Holocaust survivor Mordechai Ronen is overcome as he arrives at the former concentration camp in Poland. Ronen, who now lives in the U.S., was 11 when he was sent to the camp; his mother and sister died there.   (Odd Andersen / AFP/Getty Images)

Holocaust survivors pray upon arriving at Auschwitz for commemoration ceremonies marking the 70th anniversary of the camp’s liberation.   (Czarek Sokolowski / Associated Press)

Johnny Pekats, who arrived as a prisoner at Auschwitz when he was 14, walks through the former Auschwitz I concentration camp. Pekats later moved to New York and became a barber.   (Sean Gallup / Getty Images)

Jack Rosenthal points to the identification numbers the Nazis tattooed on his arm. Rosenthal, who was born in Romania and imprisoned at age 14 in Auschwitz and other concentration camps, returned to Auschwitz for the 70th anniversary of the camp’s liberation.   (Sean Gallup / Getty Images)

Rose Schindler, 85, who was imprisoned at Auschwitz-Birkenau, and her husband, Max, who was held in the nearby Plaszow camp, show their tattoos. The two met as refugees in Britain after the war.   (Sean Gallup / Getty Images)

Igor Malitski, who was imprisoned at the Auschwitz complex, speaks to journalists.  (Sean Gallup / Getty Images)

Ukrainian Holocaust survivor Igor Malitski walks past a photo in one of the old camp barracks, at Auschwitz-Birkenau Memorial and Museum in Oswiecim, Poland.  (Odd Andersen / AFP/Getty Images)

Miriam Ziegler, 79, holds out her tattooed arm just as she did when she was photographed with other children at Auschwitz when she was 9 years old. She is second from left in the photograph.   (Ian Gavan / Getty Images)

Miriam Ziegler, 79, left, Paula Lebovics, 81, Gabor Hirsch, 85, and Eva Kor, 80, pose on Jan. 26 with an image of them as children taken at Auschwitz at the time of its liberation in 1945.  (Ian Gavan / Getty Images)

A visitor walks past a display of prisoners’ shoes at the memorial and museum now on the site of the former Auschwitz complex.  (Janek Skarzynski / AFP/Getty Images)

Shoes of children imprisoned are displayed in an exhibit at the Auschwitz-Birkenau Memorial and Museum. Well over a million people were killed at the concentration camp complex.   (Sean Gallup / Getty Images)

Suitcases confiscated from Auschwitz prisoners lie in an exhibition display at the former concentration camp.  (Sean Gallup / Getty Images)

Guard towers and barbed wire fences stand at the former Auschwitz-Birkenau complex.  (Sean Gallup / Getty Images)