We went to the Greek branch because of our flight schedule (we stacked up our baggage in the foyer). There were people there from all over the world: Sweden, France, Canada, the USA, Greece (of course), and others. The business and prayers were all in Greek, but the talks on this particular day were both in English.
What was cool was that everyone sang the hymns in their own language! It felt like the "unity of the faith" that the scriptures talk about. It was an awesome experience!