Kohm Yah-mah-nee Visitor Center 21820 Lassen Peak Hwy Mineral, CA96063 United States
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Lassen Peak, the largest plug dome volcano in the world, is joined by all three other types of volcanoes in this park: shield, cinder dome, and composite. Though Lassen itself last erupted in 1915, most of the rest of the park is continuously active. Numerous hydrothermal features, including fumaroles, boiling pools, and bubbling mud pots, are heated by molten rock from beneath the peak. The park is 106,589 acres (431 km2) and receives 507,256 recreation visitors per year. Photo Credit: Lassen Volcanic National Park - Lassen Peak, California, October 2003 by Daniel Mayer - CC BY-SA 3.0