Stock Photo - German President Joachim Gauck, and head of the Federal President's Office, David Gill (r), are guided by restorer Kristina Moesl (l) through the special exhibition ""Der Moench ist zurueck"" (lit. the monk is back) at the Alte Nationalgalerie (Old National Gallery) in Berlin, Germany, 3 February 2016. The Alte Nationalgalerie has restored two 200-year-old paintings by Caspar David Friedrich and is exhibiting them until 22.05.2016 as part of a special exhibition on restoration. PHOTO: BERND VON JUTRCZENKA/DPA | usage worldwide. - Berlin/Berlin/Germany

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