We found a fun speakeasy type bar in Boston's BackBay called The Precinct. It's located in the Lowe's Hotel just a half a block from Copley Square, the building used to house a real police station. The decor and theme of the bar make the best of it's former life.
The Precinct serves both lunch and dinner, and in the warmer months has an outside seating area. The historical photos of police men and women past are fun to see.
You can find The Precinct at 154 Berkeley Street in Boston.