This book provides a detailed list of 300 benchmarks in Yellowstone National Park, and guides the benchmark hunter through the park in search of these interesting, often hidden little markers. Contained within the book is a concise history behind the markers, how they relate to the development of the park's road system, and how they have been used to study the volcanic and seismic processes that make the park what it is. Detailed information on appropriate safety and ethical protocols is included, as is a list of accessible benchmarks for those who are mobility-impaired, and a list of "family-friendly" markers for families with smaller children.