BUCHENWALD, Germany (CNN) -- President Barack Obama made an emotional visit to the former Nazi concentration camp at Buchenwald, Germany, Friday, saying that the camp should serve as a reminder of humanity's duty to fight the spread of evil. President Obama visits Buchenwald with Chancellor Angela Merkel, left, and survivor and activist Elie Wiesel. The visit had personal significance for the president, whose great-uncle helped liberate prisoners from the camp during World War II. "I will not forget what I've seen here today," Obama said after touring the camp with German Chancellor Angela Merkel; Holocaust survivor and Nobel Peace Prize laureate Elie Wiesel, and survivor Bertrand Herz.
@highlight
Obama recalls great-uncle's role in liberation of Buchenwald as reason for tour
@highlight
Holocaust survivor, Nobel laureate Elie Wiesel speaks of father dying at Buchenwald
@highlight
Obama met Friday with German Chancellor Angela Merkel
@highlight
Germany visit comes day after key speech in Egypt on U.S. relations with Islam
... We have to guard against cruelty in ourselves ...."  Watch @placeholder honor Holocaust victims »