What do cities look like to a runner? A set of data visualizations published this week illustrates how the paths runners take through a city can sometimes differ dramatically from the structure of roads and highways preferred by cars. The visualization, created by statistician Nathan Yau, took data from personal run-tracking site RunKeeper in 22 cities around the world. Each city merits a detailed look, but some immediate insights include the fact that people prefer parks and will sometimes go far out of their way to run around them.