-The Mid-Ohio Sports Car Course (at least I think that's the official name)
-Watkins Glen (the full track)
-Cotê d' Azure/Monaco
-Road Atlanta
-Nürburgring Nordschleife
Also one track in Canada where the Rolex sports cars run at, can't remember the name, looked like it had some really cool elevation changes.
- Nurburgring-Nordschleife
- Monaco (Cote D'Azur)
- Jacarepaguá
- Curitiba
- Dijon-Prenois
- Fuji Speedway
- Tsukuba Circuit
- Suzuka
- Brands Hatch (Full)
- Long Beach (the old one, used on F1)
- Detroit (F1 circuit)
- Laguna Seca
- Daytona (Both the oval and the road course)
- Indianapolis
- Spa
- Surfer's Paradise (CART)
- Vancouver (Indycar-CART)
- Toronto (Indycar-CART)
- Mosport Park
- Magny Cours
- and many others i forgot now...