Russian Communist Party supporters carry a portrait of late Soviet leader Vladimir Lenin as they take part in a memorial ceremony to mark the 92nd anniversary of his death at Red Square in central Moscow on Thursday
Members of the Special Forces of the German Police stand on top of the Sankt Michaelis church during a state memorial ceremony for former German Chancellor y
Visitors walk between the slabs at the holocaust memorial in Berlin, Germany.
Dan Kitwood/Getty Images
British Prime Minister David Cameron and London Mayor Boris Johnson during a ceremony at the memorial to the victims of the July 7 2005 London bombings, in Hyde Park on Tuesday in London, England
Re-enactors dressed as soldiers from the era of the Battle of Waterloo travel on an escalator after attending a memorial unveiling at Waterloo Station in London on Wednesday. The new war memorial honours all of the allied forces who fought at the Battle of Waterloo in 1815
Alexander Aksakov/Getty Images
People bring flowers to the eternal flame on the memorial of the heroic defense of Sevastopol (1941-1942) as Crimeans celebrate the first anniversary of the referendum on Monday in Sevastopol, Crimea . Today marks the first anniversary of the referendum which resulted in the annexation of the territory by Russia
Conservator Lucy Ackland cleans Winston Churchill‘s memorial stone in Westminster Abbey on Thursday in London, England. Events, including a wreath laying ceremony at Westminster Abbey, are taking place this week to commemorate the 50th anniversary of the death and state funeral of Britain’s wartime leader.
Peter Parks/AFP/Getty Images
Visitors lay flowers at a makeshift memorial near the scene of a fatal siege in the heart of Sydney’s financial district
Indian police pay tribute to the victims of the Mumbai terror attacks at a Mumbai memorial on Wednesday. More than 160 people, including 26 foreign nationals, died in the three-day attack six years ago
People gather at the Aviation Martyr Memorial in Nanjing, east China‘s Jiangsu province, on Wednesday to commemorate those who died at the 69th anniversary of victory over Japan in the second world war
Buddhika Weerasinghe/Getty Images
Visitors head to the 69th anniversary commemoration of the dropping of the atomic bomb, which in 1945 destroyed much of Hiroshima and three days later Nagasaki effectively ending the second world war. The ceremony took place on Wednesday in front of the atomic bomb dome at the Hiroshima Peace Memorial Park, Japan
Bosnian Muslim women crouch over the coffin of a relative, one of 175 newly identified victims from the 1995 Srebrenica massacre, in Potocari Memorial Center, near Srebrenica
Eric Thayer/Getty Images
A visitor prays at the grave of the Lubavitcher Rebbe, Rabbi Menachem Mendel Schneerson, at the Old Montefiore Cemetery in the Queens borough of New York
A Palestinian girl holds Turkish flags in Gaza Port on Thursday during the visit of the Turkish ambassador in Palestine Sakir Torunlar to lay flowers at the memorial of the 10 activists killed aboard the Turkish ship Mavi Marmara in 2010 after it was boarded by Israeli forces
Lakruwan Wanniarachichi/AFP/Getty Images
Sri Lankans read a memorial for those killed in the decades-long conflict against the Tamil Tigers to mark National War Heroes Day in Colombo
President Barack Obama and first lady Michelle Obama, along with former Secretary of State Hillary Rodham Clinton and former President Bill Clinton tour the Memorial Hall at the National September 11 Memorial Museum with former New York Mayor Michael Bloomberg, Thursday
Wakil Kohsar/AFP/Getty Images
Afghan children pose for a photograph holding images of victims of war during a memorial ceremony in front of the destroyed palace of Darul Aman in Kabul. Members of the Transitional Justice Group, survivors and civil society activists gathered to pay tribute to the memory of those killed during the last three decades of war in Afghanistan.
Chung Sung-Jun/Getty Images
Students from Danwon high school pay tribute to fellow classmates at a special altar at the Olympic Memorial Hall in Ansan, South Korea, to the victims of the ferry disaster in which 150 passengers are known to have died, with another 152 still missing
Christopher Furlong/Getty Images
Liverpool fans sing ‘You’ll Never Walk Alone’ during a memorial service on Tuesday marking the 25th anniversary of the Hillsborough disaster at Anfield stadium in Liverpool, England
Mejra Dzogaz cries near the graves of her family members at a memorial centre for victims of the Srebrenica massacre in Potocari, Bosnia. Ms Dzogaz lost her three sons, husband and father in the massacre.