A big, walkable lava tube in Hawai‘i Volcanoes National Park, formed when the outside of a river of lava cooled to a crust while the molten rock inside drained away, leaving a tunnel you can stroll through in minutes, hung with tree roots reaching down through the roof. It is the easy, beautiful introduction to what the whole island is built of. PUBLIC, Hawai‘i Volcanoes NP, Big Island.
Hawaii
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Other places on the map within a couple of hours.
