Global Terrorism Database ANTz Visualization
This data is courtesy of the Global Terrorism Database. Visit the GTD. Here's the official citation for their outstanding database:
Download ANTz GTD viz (sorry, Windows only). Run antz.exe and hit the 1 key to load the data.
Each object represents a terrorist-related event. Size is proportional to the number of people killed, color is the type of attack which occurred according to the legend below.
GTD By Terrorist Group
GTD Terrorist Groups Merged With Geospatiotemporal Data