This is a fascinating lava tube is right of Highway 89 and very near Highway 44. It is a 1/3 mile underground lava tube formed when the the outside of a lava flow hardened in the air an insulated the inside lava. The interior lava continued on its flow, eventually leaving the tube empty. The walls, ceilings, and floor of the tube are covered with neat textures and features that the lava flow left behind. Lavacicles hang from the ceiling, what were once molten bubbles have hardened, mid-bubble, into stone. The terrain is rough (part of the cave is called stubtoe hall) so shouldn't be attempted in flip flops. It is very dark, bring a flashlight or headlamp. It is also chilly in there. We were fine without a hoody in mid-July (we found the cool to be a great relief and walked back through the cave instead of using the above-ground shorter path) but I imagine most of the year, bundling is necessary.
There are no rangers on site and there is no fee to visit the caves. There are bathrooms and running water.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.