This Sankey Diagram shows the different terrorism attack types used in different regions of the world. We see that overall, there are the most incidents in the Middle East & North Africa and South Asia regions, and that bombings/explosions and armed assaults have been the most common types of attacks. Beyond this, there are not any especially clear patterns that emerge.
I nevertheless wanted to include this visualization on my website for a few reasons: First, Sankey networks can be powerful for enabling patterns to emerge visually. Second, I find them to be aesthetically appealing. Finally, it is an example of a visualiztion I have created with R's NetworkD3 library, which is one of several fabulous libraries that enables non-D3 experts to create beautiful D3 visualizations.
You can find the code I used to create this visualization here. Here are links to the node data and edge data. The full Global Terrorism Database is posted -- along with many visualizations by other people -- on Kaggle.