San Bernardino County, CA
Mitchell Caverns and Winding Stair Cave, a National Natural Landmark in San Bernardino County, CA.
National Natural Landmarks in this county include:
- Amboy Crater
- Cinder Cone Natural Area
- Mitchell Caverns and Winding Stair Cave
- Rainbow Basin
- Trona Pinnacles
- Turtle Mountains Natural Area
Please remember, National Natural Landmarks (NNLs) are not national parks. NNL status does not indicate public ownership, and many sites are not open for visitation.