Lava Beds National Monument
Tulelake, CA · Modoc Plateau$
Tucked into a high desert plateau near the Oregon line, Lava Beds hides more than 800 lava tube caves under its sagebrush, the densest concentration in North America, and 27 of…

Photo: King of Hearts / CC BY-SA 4.0 · source
Behind a wrought-iron spider-web gate the Civilian Conservation Corps forged in 1940, Crystal Cave opens into a marble cavern an underground stream carved and is still polishing smooth. The lantern-and-walking tour, the only way in, winds a half-mile loop past stalactites, draperies, soda straws, and rimstone dams, with whole walls of marble worn to a sheen by the water. It is the single cave open to the public out of more than 240 mapped in the park, holding a steady 48 degrees while the Sierra bakes overhead.
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