The 24 Hours of Le Mans
This race is synonymous with the sport. While at times a part of various series, it has always been organized independently by the ACO. Often cars appear only here and at no other races, so it deserves to be its own category.
Period	From	To
The Ford GT40 era	1966	1969
The Porsche 917 era	1970	1971
The 3-litre era	1972	1977
The Porsche 936 era	1978	1981
The Birth of the Group C era	1982	1985
The golden age of Group C	1986	1990
The long, slow, agonizing death of the Group C era	1991	1994
The Mclaren F1 and the 'GT1' revolution	1995	1996
Prototype & GT1 Smackdown	1997
Factory Battle Royal	1998
Mercedes re-enacts 1955 (sort of)	1999
Audi smokes 'em all	2000
Audi smokes 'em all again	2001
Audi smokes 'em all again	2002
Bentley rolls on.	2003
The Privateer Audi Era	2004	2005
The R10 Diesel Era	2006	2008
The Audi/Peugeot Diesel Era	2009	2011