“Come, morphine addicts, come and kill us in our own land,” wrote Nicaraguan guerilla leader Augusto César Sandino in a manifesto in 1927. “But keep in mind that when this happens, the Capitol building in Washington will shake with the destruction of your greatness, and our blood will redden the white doom of your famous White House, the cavern where you concoct your crimes.”

Among those who stayed at the Florida Hotel while reporting on the Spanish Civil War were John Dos Passos, Ernest Hemingway, Josephine Herbst, Robert Capa, Antoine de Saint-Exupéry, and Martha Gellhorn. Gellhorn noted a day when an “influx of shits” came for lunch, one of whom was “a nice handsome dumb named Errol Flynn who looks like white fire on screen but is only very, very average off.”

As he watched the mushroom cloud form at the first atomic-bomb test in July 1945, physicist J. Robert Oppenheimer recalled a line from the Bhagavad Gita: “Now I am become Death, the destroyer of worlds.”

As a London-based correspondent for Horace Greeley’s New York Tribune, Karl Marx wrote about Abraham Lincoln’s issuing of the Emancipation Proclamation, “Up to now we have witnessed only the first act of the Civil War—the constitutional waging of war. The second act, the revolutionary waging of war, is at hand.”