If you ever wanted to live out your Cool Runnings fantasy then you may want to book a flight to Eastern European.
The now-abandoned bobsled track from the 1984 Winter Olympics in Bosnia-Herzegovina makes for a wild ride for these mountain bikers on Mount Trebevic, although it's all kinds of intense and probably shouldn't be attempted by amateurs. Especially seeing as it's no longer maintained.
Be sure to watch this one in the 720p60 HD option to get a real feel for how fast they were going.
Via YouTube