Though few people even know it exists, hidden deep in the mountains north of Los Angeles is quite possibly the most impressive motorsports training center on earth: The Red Bull Compound. Built and maintained by the energy drink powerhouse, this wonderland features all of the tools needed by Red Bull's elite athletes to do what they do best: shred. From Supercross tracks to freestyle parks to foam pits and Outdoor courses, this place has it all. Dirt Rider was recently invited out on a secret mission to the Red Bull compound, where we were able to capture some of the location's magnificence, as well as a private test session with the Honda Red Bull Racing Factory team. Check out the following images for a sneak peak of this crazy spot!