Saw this article in a BMW link. I thought it was interesting. Because of my recent move to the Heartland (e.g. Kansas City), I have actually driven seven of the seventeen (Hallett, Road America, COTA, Mid Ohio, Watkins Glen, Daytona and VIR).
http://www.supercompressor.com/rides/the-best-race-tracks-in-america
I imagine Eric S and a few others can claim more (Canadian and west coast tracks), I think it fun to see what the Dorki poll is.
As an aside, I found this amusing poster which depicts several of the noted tracks around the world (including Summit):
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'04 996 GT3 (SOLD)
'87 Targa (Retired DE car-bought new)
'13 Cayenne Diesel
'14 BMW 428xi
'09 Boxster S (sold)
'02 996 Turbo (sold)
'04 Cayenne S (sold)
'98 Boxster (sold)
'84 280Z Turbo (sold)
'61 Austin Healy "Bug-Eyed" Sprite - High School chick (?) car (sadly sold)
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Some luck lies not in getting what you thought you wanted but getting what you have, which once you have got it you may be smart enough to see is what you would have wanted had you known.