This part of our trip to Idaho last week. Craters of the Moon is a National Monument in Idaho. It is a series of tubes and caves carved out 2,000 years ago. There is a large lava field covered in volcanic rock. Because we had little kids, and I was carrying a child carrying backpack, we could only do Indian Cave and didn't feel like we could handle the entrance to the Boy Scout Cave.
It was a good time, and a easy introduction to caving for my kids. If you are in the area, I'd strongly recommend doing Black Magic canyon (about an hour way toward Twin Falls).
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