Joshua Tree National Park, California
Eagle Cliff Mine was founded in 1895 and is one of the oldest mines in Joshua Tree National Park. Due to its remote location, burrows were used to pack out the ore. Eagle Cliff was added to the National Register of Historic Places in 1993. The cabin is a circular rock structure that was built into a cliff. Cornerstones partners with the National Park Service to create a stabilization plan, to stabilize the stone and mortar mine cabin, and to host training workshops for volunteers, students, and NPS personnel. The site is in a designated wilderness area so no mechanical tools can be used.