Spa 6hrs
(The September Historic one for Pre '66 GTs and Touring Cars. GT40s, Cobras, Jaguar 'E's, Bizzarrinis, Corvettes, Mustangs, Falcons, etc plus all the smaller classes. Last year 114 starters...)
Le Mans 24hrs
Bathurst 1000
Sebring 12hr
Daytona 24hr
The above from experience as a spectator, competitor or watching at home!