Jack El-Hai | Longreads | March 2015 | 14 minutes (3,509 words)

A New York City stockbroker named M. Leopold was working in his office at 84 Broadway shortly after noon on December 4, 1891, when he sensed vibrations, an odd rumbling. Looking outside, he saw flames and a cloud of smoke shooting out from a window of the Arcade Building directly across the street. A man’s body then flew out through the opening, landing on Broadway. Leopold raised his window and smelled the tang of dynamite.