Ooh this is tough.... What to choose.... I'm going to say Silverstone but it's a tough choice.
I voted for Road America.Le Mans
Nurburgring GP
Donington
Road America (I love old Spa, just voted Road America to avoid an 8-0 which is not what Road America deserves)
*Road AtlantaThe picture of Ahvenista isn't working
*Road Atlanta