What are the most prestigious auto or motorbike races?

I should add I have 18 races added to my list. The races I have already listed are...

-Indy 500

-Pikes Peak Hill Climb

-24 Hours of Le Mans

-Monaco Grand Prix

-Daytona 500

-Dakar Rally

-Monte Carlo Rally

-Isle of Man Tourist Trophy

-British Grand Prix (auto)

-Wales Rally GP

-Italian Grand Prix

-Baja 1000

-Safari Rally

-Rally Finland

-German Grand Prix

-Belgien Grand Prix

-Bathurst 1000

-Rally Sweden

...any others you think should be added?