In my experience, a good bar or coffee shop on campus or juuuuust off campus is where great gelling happens. You are not 'in lab' and if there is beer, it is a very good indicator that you are relaxing (the chance of drowning sorrows is noted). You are essentially 'open' to conversation and talking about life. Being scientists,most of life is science, and the 'other' space allows for a freedom of thought and truth not afforded in a more sterile work environment. Also, the use of stimulants or depressants helps to kick people out of their ruts in addition to the new space.
Not all gelling happens in bars or cafes, but I do think they have a great correlation to great discoveries. In fact, I wonder what the actual data says? What does HN think are good metrics to measure this? Proximity to lab benches, cost of drinks, variety of foodstuffs, size of the shop?
Also, I wonder what the introduction of legal marijuana to those states will do to their use of 'other' spaces and areas that you can run into and talk with other researchers. Perhaps an alternative to stimulants and depressants, here being a mild hallucinogen with pot, will uncover new thoughts and ideas to benefit research.