that's definitely the hidden gem outside lassen on your way north. we didn't even know that this place exists and just saw the sign on the road and decided to come in... of course without flash lights.
it's a 5 minutes walk inside the darkest cave i've ever been to, but then again we were using our cell phone light. it has some picnic tables outside so if someone doesn't want to come inside they can stay there since the trail goes in a loop you get back to the starting point. a sure stop but bring flash lights!
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