From Robert Capa, a pioneer of photojournalism who died in Indochina, to Rémi Ochlik, the young French reporter killed in Syria, hundreds of photographers have recorded the great events of our time: from the Spanish Civil War to the two world wars, from the revolts of 1968 to South Africa's liberation from apartheid, from Vietnam to Indochina, from Bosnia to the fall of the Twin Towers and the dramatic events of the Arab Spring. These photographers are modern heroes who face danger and at times risk their lives to be there, present, as witnesses of history.