4. 23 Wall Street
23 Wall Street, the Morgan Guaranty Company Building and J.P. Morgan Bank headquarters, circa 1914. Photo via Library of Congress.
In the same neighborhood and almost 100 years earlier, The Wall Street bombing occurred killing 38 people and seriously injured 143. Though the bombing was never officially solved, historians connect the events to the Galleanists, a sect of Italian anarchists, as the group was responsible for similar attacks the previous year. You can still see evidence of this bombing on the facade of the building at 120 Wall Street today.