must say it's one of the most technically challenging tracks i ever been to.
Located in Canada near Ottawa, it has 22 turns and a lot of elevation
changes.
http://www.racesimcentral.net/
You can also go to Youtube and type "Calabogie" in the search bar to find on
board videos.
Apparently, there is a guy working on a GPL version and a rFactor conversion
might follow. I have a feeling that once this track becomes public, it will
become a fan favourite.