The world is marking Holocaust Memorial Day, held each year on the anniversary of the day Auschwitz-Birkenau, the Nazi extermination camp, was liberated in 1945.
A single rose is pinned to barbed wire at Auschwitz-Birkenau, the largest of the Nazi camps, located in southern Poland.
A former prisoner lays a candle during a ceremony at Auschwitz-Birkenau to pay tribute to the people killed by the Nazis.
Young people from 62 countries gathered at Jerusalem's Yad Vashem Holocaust Memorial for a three-day youth congress to mark the anniversary.
Visitors toured Yad Vashem before attending a memorial service in the Hall of Remembrance, where they read out the names of Jews who perished.
Nearly 90% of Greece's 80,000 Jews were killed during the Holocaust. Children were among those who attended a memorial service in the port city of Thessaloniki on Sunday.
In the UK, survivors of the Holocaust and other genocides attended Liverpool's Philharmonic Hall for a service which included an address by the Archbishop of Canterbury.
On Saturday, French Foreign Minister Bernard Kouchner had laid a wreath at the Rwandan genocide memorial site in Kigali. Some 800,000 Tutsis were slaughtered by Hutus in 1994.
On Friday, the German parliament had commemorated Holocaust victims in a ceremony acknowledging a special responsibility in the battle against anti-Semitism and racism.