
In the Naches Valley lies Boulder Cave, an unusual cave that's open for public exploration.  Most caves are eroded from limestone, but this one was created by regular erosion of a streambed.  Its roof is from rockfall over the gorge that the stream created.
The portion that is fully dark isn't that long, but one would not have too much fun without a headlamp.  
The cave is alleged habitat for Townsend's big eared bat, but we didn't see any on our visit.
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