Holocaust Memorial

Beach-goers stand still as a two-minute siren marking annual Holocaust Remembrance Day in Israel is sounded in Netanya, Israel May 5, 2016

Baz Ratner/Reuters

Beach-goers stand still as a two-minute siren marking annual Holocaust Remembrance Day in Israel is sounded in Netanya, Israel today

US first lady Michelle Obama visits the Holocaust Memorial together with her daughers Malia and Sasha, from left to right, in Berlin, Germany,.

Jens Meyer/AP

US first lady Michelle Obama (left) visits the Holocaust Memorial with her daughters Malia and Sasha in Berlin, Germany. US President Barack Obama and his wife are on a two-day official visit to Germany.