It's usually pretty easy to avoid touristy swamps in New York—just dodge Times Square. But what if you want to be more precise than that? Eric Fischer's brilliant "Locals and Tourists" maps show a city's divided hangouts.

Using photo geotags, Eric separated blue "people who have taken pictures in this city dated over a range of a month or more" (locals) and red "people who seem to be a local of a different city and who took pictures in this city for less than a month" (tourists). The results are both beautiful and insightful. While some parts of the city are a swirl of insiders and outsiders, there are wide stretches that are photo-segregated. Fisher's work spans cities far beyond New York—from Budapest to Hong Kong. Turning cities into abstract, GPS-correlated red and blue heat maps doesn't make them impersonal—it opens up the humans down below. [Eric Fischer via Alex Rainert]