Assets / #36434: Subway Cave

Subway Cave, a lava tube north of Lassen Volcanic National Park, on Hwy. 89. Lava Beds National Monument encompasses over 46,500 acres and contains the largest concentration of lava tube caves in the United States. While lava tubes are not unusual in volcanic areas, the vast quantity found at Lava Beds is.

Public domain. National Park Service, 1964

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