America is known for some famous endurance races: Petit Le Mans, the Sebring 12 Hours and the Daytona 24 Hours are events that resonate with motorsport fans all over the world. But you'll likely get blank stares back if you mention the US's longest endurance race: the Thunderhill 25 Hours.
Never heard of it? Neither had we. But American endurance racing's best-kept secret has been running for a decade, on a circuit that last year celebrated its 20th anniversary.
Think of Britcar's Silverstone 24 Hours, but on three miles of undulating purpose-built track in the North Western part of California's Great Central Valley...
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Ben Anderson is Autosport's Grand Prix Editor and one of our track testers. He holds an undergraduate degree in journalism studies from the University of Sheffield and joined the title in March of 2008, after eight months working in local newspaper journalism for award-winning weekly the Surrey Mirror. He has raced karts and cars since the age of 11, and occasionally continues to do so around his reporting commitments for Autosport.@BenAndersonAuto More features by Ben Anderson