The site of the Lexington Avenue Explosion on July 4, 1914.

Members of the Anarchist Black Cross along with a member of the Industrial Workers of the World had been plotting to assassinate John D. Rockefeller by blowing up his home in Tarrytown, NY. Their dynamite explosive detonated prematurely, killing four — including three conspirators — and destroying the upper floors of 1626 Lexington Avenue.