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Lassen Peak, one of the worlds largest plug dome volcanoes, last erupted in May, 1914.  Called a miniature Yellowstone by many, mud pots, fumaroles and boiling water continue to this day.  Lassen is part of the Pacific Ring of Fire.  This view from Highway 89, which traverses the park, looks from near the summit south to Mt. Lassen
090716_Seattle_Sonoma_1261 Lassen Volcanic National Park.jpg