United States of America
Labyrinth Cave (1,239 ft/378 m) and Lava Brook Cave (859 ft/262 m). These caves near the Visitor Center are connected by way of a segment requiring crawling and twisting. Ceiling heights vary but tend to be low throughout. Pay attention to your route, as the name Labyrinth suggests! The "Lava Brook"
is an interesting pattern left on the floor of one passage by the last lava flow.
Listen to the audio guide for Lava Brook Free on WIP — starts by itself when you arrive, even with the screen off