Movements of immigrant detainees in the U.S.Immigration and Customs Enforcement (ICE) system.
From this great post at School of Data by Human Rights Watch’s Brian Root.
I especially appreciated the screen shot of the raw data. People who don’t do this sort of work often seem to think that data just lies around, waiting to be analyzed at the press of a button. In fact, that’s usually the last and shortest leg of a much longer journey, most of which is alternately boring or frustrating.