Your Journey Guide to the Underground If you crave adventure, an "off the beaten path" way to explore California, the answer is in your hands, literally. California Underground Adventures delves into the state's best caves, mines and lava tubes. Plus the authors', Jon Kramer & Julie Martinez, tongue-in-cheek notes make this guidebook almost as fun to read as the caves are to explore! Features Informative and entertaining guide to California's lava tubes, mines and caves Complete site details including temperature, information on guided and self-guided tours and driving directions Fascinating details about each site's history and geology Full-cover photographs of underground wonders Jon's Candid tips that help you see the sites through experienced eyes