Imagine hiking along a wooded trail near San Francisco and stumbling upon the stone foundation of a crumbled building, the wooden slats of the walls caved in, the ironwork of the hinges still dangling on the burned out door. This discovery piques your interest -- what is this? What's its significance? How can you find out? Make no mistake -- this is a hiking book first and foremost, complete with rich photos and detailed maps, but with added extras and sidebars detailing enough historical information to satisfy every curiosity along the way. --Publisher's description.