Things to do nearNāhuku Lava Tube

Nāhuku Lava Tube, also known as Thurston Lava Tube, formed when the outer surface of a lava flow cooled and hardened while molten rock continued moving through the interior. Once that flow drained, it left behind a hollow tunnel roughly 10 to 20 feet high in places. The tube is estimated to be around 500 years old, making it a relatively young feature in geological terms, though it feels primordial the moment you step inside.

The walk begins in a sunken fern forest, a lush pocket of native hapu'u tree ferns and 'ohi'a lehua trees that frames the entrance dramatically. Inside, electric lighting illuminates the main passage, while a darker unlit extension rewards those who bring a flashlight. The walls display layers of hardened lava in rippled and ropy textures, and small drips echo through the chamber. Nearby, Kīlauea Iki Crater offers a striking above-ground companion to the underground experience.

Nāhuku is part of Hawaiʻi Volcanoes National Park, a UNESCO World Heritage Site, and sits along Crater Rim Drive within easy reach of other landmarks. For anyone curious about the volcanic forces that built the Hawaiian Islands, it is an essential and accessible window into the earth.