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In Lava Beds National Monument (Northern California), this is the Mushpot Cave trail, which is a cave created when red hot lavas flowed underground. Once the lava drained away, this lava tube cave was left behind. There are over 500 such caves known to exist in Lava Beds National Monument (some are over a mile long), with new ones discovered each year. The red line is a series of red lights placed by the National Park Service to light along the paved trail (Mushpot is the most easily-accessible trail). (09/29/2004)