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Terrorism has existed in many forms throughout history, but never before has it posed such a grave threat to our civilization. As we saw with the attacks carried out against the United States on September 11, 2001, along with the persistence of those terror organizations hereafter to facilitate assaults against democracy-based countries, greater understanding of these groups is needed to anticipate the threats they pose.

To understand the terrorist mind-set that has evolved from the Middle East region—from which today's greatest threats stem—we must first examine the historical background that set the stage for the events that would unfold over several generations, from biblical times to modern day, with the hopes this comprehensive reference will aid in disaster preparedness and threat-mitigation education.

Send your comments, suggestions. Help us keep this list accurate and up-to-date and let us know if you see any inaccurate information, or if you believe that a significant terrorist incident has been missed. Content is judged for inclusion based on the damage/casualties they produce and their significance in history.