September 11, 2001 is a date that will go down in history for friends and foes alike. The tragic death of nearly 3,000 American citizens in the maelstrom of the spectacular and deliberate ramming of commercial airliners into the World Trade Center and their subsequent collapse is the inspiration for a great deal of U.S. foreign policy and the impetus for Al-Qaeda, the Islamic fundamentalist group responsible for the attacks. The world changed that day because of those horrific events: Suddenly we were at war, regardless of the lies that led us there, in two different places; civil liberties were curtailed; the rule of law came head to head with exceptions, and other deadly terrorist attacks sprouted out of nowhere in other parts of the world. In the meantime, average citizens were panicking and frightened as the world watched in horror the events unfolding from their living-room sofa. It sounds like the plot of a Hollywood movie, but it’s unnervingly real. It also seemed like a new phenomenon, something hitherto unknown in the realms of realpolitik, but the mass slaughter of innocent people for political gain is not new and before 9/11 many acts of terrorism were committed with great effect and horror. Here are the 10 most horrific terrorist acts prior to 9/11.