I know some of these have been mentioned but I would go for the following:
1) Kyalami - South Africa
2) Istanbul - Turkey
3) Jarama - Madrid, Spain
4) Dijion - France
5) Zolder - Belgium
6) Zandvoort - Holland
7) Brands Hatch - Great Britain
8) Mosport - Canada
9) Watkins Glen - USA
10) Long Beach - USA
11) Hermanos Rodriguez - Mexico
12) Buenos Aries - Argentina
13) Estoril - Portugal
14) Dubai Autodrome - Dubai
15) Okayama Intenational Circuit - Aida, Japan
16) Adelaide - Australia
EDIT - Keke and I have posted almost the same list at almost the same time. Great minds and all that....
