Thirty-six rooftop bars, pinpointed and mapped for your convenience.

A team in the Arlington Department of Environmental Services’ Mobility Lab sifted through three months’ worth of Capital Bikeshare data to determine which stations are the most popular in the 1,700-bike system.

From this Forbes data visualization on county-to-county migration within the U.S., it would appear that in 2008, the District metro area was a net importer of northerners and a net exporter to the south. You may not be able to tell it from the image I downsized to fit the page, but look on the map proper and you will see a thin but unmistakable red ray — like a bright band on a…