Le Mans is run at Sarthe. More to the point, Francorchamps isn't in the game4.) Spa ( like Monza used to hate it, after watching 24 Le Mans and spending some time on it, I'm hooked)
Monaco keeps me amused for hours, as does Trial Mountain oddly enough. TM is my stomping ground for any lightweight import.
StrittanAll "world tracks" are my favorites. I drive them all equally much.
Although I've played GT since the first game I'm not too keen on the fictoinal tracks.