President Barack Obama signs a guestbook before touring Buchenwald Concentration Camp in Germany with German Chancellor Angela Merkel and Holocaust survivor Elie Weisel, June 5, 2009. (Official White House photo by Pete Souza.

This free, public domain photograph may not be used in materials, advertisements, products, or promotions that in any way suggest approval or endorsement of the President of the United States, the First Family, the White House or any persons appearing in the photos.

This free, public domain photograph may not be used in materials, advertisements, products, or promotions that in any way suggest approval or endorsement of the President of the United States, the First Family, the White House or any persons appearing in the photos. Stock photography by White House Public Domain.

Copyright: United States Government Works

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