Given I'm from Colorado, I'd have to go with Century 21 Speedway (Aurora, Co), with Continental Divide Raceway (Castle Rock, Co.), being right there too! I was 3yrs too young for CDR's last divisional race, and I'm not sure when Century 21 closed down, but I did have a chance to run my former '66 Impala 396/325hp down the track before they completely lifted the asphalt from it....born too late (they made a song saying that, albeit not for the same reason I had)...lol