We know of NYC and London, are there others?

Ok so as actors, musicians, and audience members we are very familiar with "the Great White Way" and the "West End"; New York and London respectively as hubs for theatrical presentations. But are there any others? In short yes, if you go to Broadwayworld.com and look for the "world" tab you will see a list of countries from South Korea to India where you will find theatrical presentations happening, workshops in the making, and of course tours about to come through.

My question is what makes NYC and London these centers of our artistic world. New York I guess we can rationalize because it is the melting pot and many years ago where else in the U.S. would producers be finically secure they would recoup their investments. I guess we could rationalize about London that Shakespeare came from Stratford just around the corner, but didn't theatre originate in Greece? Why isn't Greece one of these central hubs? I know in America we preview shows in Los Angeles, Seattle or Chicago before transferring to NYC. Does the same happen in other countries as well?

It makes me wonder if say I were a young man in Poland, how would I be able to see an amazing theatrical production as we have in NYC. Would I have to save up to go to London? Do we feel these cities are lacking financial backing to promote such an industry? I read an article years back the the Entertainment Industry is the most expensive industry in the world. Keeping in mind this includes T.V., sports, movies and many other types more than just theatre. But then one can ask oneself the inevitable question... WHY? Why is entertainment to prosperous but not readily available to everyone? Is it those particular governments laws or regulations? I don't know these answers but upon browsing Broadwayworld.com today, the thought just happened to cross my mind. Do with it what you will.
V