To understand why St. Andrews' Old Course is not just the "Home of Golf," but also the most significant golf ​course in the world, it's important to understand just how much of the game's history has run through this unique seaside layout. From the course's deceptive complexity to its seminal moments, Dan Rapaport outlines everything that makes the Old Course so vital to the game's identity, and why the Open Championship there this week comes at a fractious but opportune moment.