I figured people could use this thread as a reference for those traveling. North America D.C. New York Boston Montreal Los Angeles (?) Florida has one but it's small Europe London Zurich Barcelona Amsterdam
Roma's DC club meets at Ireland's Four Courts, 2051 Wilson Blvd, Arlington, VA 22201. I have only attended a couple of times, but they get a good turnout for every game. Very dedicated fan group.
It’s been a few years since I’ve gone, but the one in Philly is pretty great. Unfortunately I had to move out of the city as soon as I discovered it.
2 years ago I visited Roma Club New York at Grey Bar couple of times, remember watching Milan-Roma. It was nice atmosphere. I recommend everyone living near NYC to visit the bar.