Ask HN: How would you envision the physical equivalent of the HN community?

Recently there was a post about Lloyd's Coffee House and other similar establishments in which people could discuss ideas ranging from the economy to philosophy - a kind of intellectual melting pot. It seems to me that HN is a (somewhat) modern equivalent of that. However finding such a community day-to-day is more difficult. I find some of the trademark qualities of this community to be innovation and intellect, but more importantly, level-headed discourse between differing perspectives. Am I alone in finding that these qualities embody a minority? How would you bring to life such an environment in the real world? Exclusive bar? Intellectual cafe? Or am I simply seeking a phantom of the past?