Of course New York City and then Boston and Philly will have the historic courses as these cities contained almost everything of significance in American golf until the late 1920s. However, many metro areas offer wonderful varieties of golf architecture. Chicago and Columbus jump to mind immediately. Why even look at my home town of St. Louis:
MISSOURI:
St. Louis CC
Glen Echo
Algonquin
Norwood (West & East)
Westwood
Meadowbrook
Old Warson
Bellerive
Boone Valley
Players Club
Fox Run GC
Persimmon Woods
St. Albans
Forest Park (re-design)
Normandie
Crystal Highlands
ILLINOIS:
Annbriar
Gateway National
Spencer T. Olin
Orchards GC
These are 20 very good courses. I would recommend any one of these courses as worth the effort to play. They cover a wide range of time-periods and styles of architecture.
Many metro areas offer a full range of good to excellent golf courses where one could live their whole life and experience a full variety of golf during the long periods at home between one's occasional travels. However, to focus on the courses where golf was born (and thus will always contain a certain historical significance), is to miss out on many other "sleeper" locals for very good golf all over the country.
I am not stating that this list of courses is equal to the top 20 courses on L.I. However, everyone on this board cannot just relocate to NYC and then have access to these courses. In fact, many on this board live in metro areas not immediately thought of as focal points of great golf architecture. Although, if you turn your eye to your home region, it will soon be noticed that a full table of golf architecture can be explored without leaving town.
This may seem an obvious point to make, but at times it does seem that outside of about 4 cities, that for the remaining of America most discussion on this board is reserved to only the most significant couple of courses per city.
It would be the equivalent of only discussing the books of Updike, Bellows, Pynchon, and Roth, while forgetting Heller, Malamud, Fisher, Cheever, or Vonnegut.
Or as if one only heard the symphonies of Beethoven and Mozart, but missed anything by Sibelius, Saint-Saens, or Ives.