September 11th 2001 is the most photographed event/ day in history while the swearing in of Barack Obama may be the most photographed moment. WW2 is the most photographed event in world history. Although it lasted a lot longer than one day.
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The attacks on the World Trade Center of September 11, 2001 are the most photographed and filmed events in human history.
The most important event in all history is the coming of Jesus Christ.
The most important event in American history that starts with the letter O is probably the Olympics.
Because it was the most important event in human history.
Arthur Dent's arrival on the planet Magrathea.