The vibrant history of the challenges and successes in the preservation of lands on and around Mt. Tamalpais, Marin County, California, and the key role of the Tamalpais Conservation Club played throughout the last 100 years. It is the history of how many key men and women, like William Kent and Alice Eastwood, and both public and private organizations came together for these efforts. This is the first time this has been documented in one book. This is as well a story of the birth of the environmental movement in the Western United States. The seeds were planted by earlier pioneering environmentalists such as President Theodore Roosevelt and John Muir, an honorary early TCC member. The book is rich with stories of people who made a difference through their passion and love for Mt. Tamalpais. The book, commemorating the TCC's 100th anniversary, includes narratives of the creation of the TCC, Muir Woods National Monument, Mt. Tamalpais State Park, Marin Municipal Water District, Golden Gate National Recreation Area (GGNRA), Marin County Open Space District, and other public areas on the mountain. Over 200 historic photos and documents are included.