ESRI, an international supplier of Geographic Information Systems (GIS) software, put together this interesting map of the world's 25 busiest airports. As ESRI notes on the map, "More than 1.4 billion airline passengers departed, landed, or connected through these massive facilities in 2012. Viewing them from above gives a sense of their gargantuan scale and global significance."
The World's 25 Busiest Airports
You have the option to view them on a global scale, or zoom into a specific airport for a better sense of its complexity. Consider: What bearing does this have on the way we plan our transportation hubs and urban centers?