A World of Terror [periscopic.com] by Periscopic shows the reach, frequency and impact of about 25 terrorism groups around the world.
The visualization exists of 25 smartly organized pixel plots that are displayed as ordered small multiples. Ranging from Al-Qa'ida and the Taliban to less known organizations like Boko Haram, the plots reveal which ones are more deadly, are more recently active, or have been historically more active. In addition, all data can be filtered over time.
The data is based on the Global Terrorism Database (GTD), the most comprehensive and open-source collection of terrorism data available.