2. Circuit de la Sarthe (Le Mans)
Why did it make the list:
- exceptional history, with pilots ranging from the "Bentley Boys" to Mario Andretti and Bruce McLaren.
- home of the 24h of Le Mans, the world's oldest endurance race
Why it didn't score higher:
- not that popularized in the past years.
- there aren't that many races held here.
It's hard to find a video to represent the amazing history of Le Mans, but this should at least scratch the surface.
Also, this is a very interesting blog post about the history of Le Mans.
1. Circuit de Monaco
Why did it make the list:
- best known circuit in the world
- most demanding track in Formula 1 racing
Why it didn't score higher:
- not up to current safety standards of Formula 1.
There aren't enough words to describe the circuits, so I'll let a video, of the great driver Ayrton Senna around this track, do the talking.
Also, you can see below the table with the scores for each track (click to enlarge).