US racecourses are among some of the largest arenas hosting any sporting competition in the world. NASCAR is the most popular motorsport in the US and attracts crowds that are often a sight to behold. These are the sport's largest venues: 8. Charlotte Motor Speedway 7. New Hampshire Motor Speedway 6. Dover International Speedway 5. Daytona International Speedway 4. Las Vegas Motor Speedway 3. Kentucky Speedway 2. Bristol Motor Speedway 1. Indianapolis Motor Speedway