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Associated Press

Since the Formula One World Championship era began in 1950, 69 circuits have hosted at least one grand prix.

Some, like Spa-Francorchamps, Silverstone and Monza, stand out as true jewels in the sport's crown. Modified over the years to keep up with the changing face of F1, these circuits never lost their character.

Others, like AVUS, Phoenix and Valencia, never had any to lose.

And in between we encounter the likes of Watkins Glen, the Osterreichring and Suzuka—all great motorsports venues, but without the same lengthy F1 history as their more illustriously considered peers.

How on earth do we even begin to rank them all?

In this article, I've started with the number of races the circuit has held. This figure is then multiplied by what I've called "F1 Factor"—a score out of 20 based on a number of things including layout, historical significance and quality of racing—to reach a final ranking score.

This score is then used to rank the circuits in terms of their overall contribution to the history of F1.

Using this formula, here are the top 25 F1 circuits of all time.