Four years ago today, Barack Obama delivered a speech at Berlin's Siegessäuleto to an estimated crowd of more than 200,000.
Obama introduced himself as a "fellow citizen of the world" while proclaiming that he didn't "look like the Americans who've previously spoken in this great city."
Some of the reactions from around the world that followed his speech:
The Guardian (UK): Obama wows Berlin crowd with historic speech
The Telegraph (UK): Barack Obama's visit causes excitement in Germany
The New York Times: Obama gets pop star reception in Berlin
Shortly before the speech, after being told the Pentagon would not allow Obama to be accompanied by campaign staff and the press, the Obama campaign announced that it was scrubbing plans for Obama to visit wounded American troops at Landstuhl Regional Medical Center in Germany.