From the National Consortium for the Study of Terrorism and Responses to Terrorism (START) at the U. of Maryland:
The Global Terrorism Database (GTD) “World Map: 45 Years of Terrorism” displays the concentration and intensity (combining fatalities and injuries) of terrorist attacks that occurred worldwide across 45 years of data.
Direct to 1970-2015 World Map
Direct to The Global Terrorism Database (GTD)
“Information on more than 150,000 Terrorist Attacks”