Lassen Volcanic National Park

All 4 volcano types in one park. Boiling mud pots still active.

Lassen Peak last erupted in 1915, and the hydrothermal areas are still violently active: Bumpass Hell is a boardwalk through boiling mud pots, fumaroles, and acid pools. The park gets about 500,000 visitors — respectable, but still just 8% of nearby Yosemite's annual 3.9 million. Winter buries the roads under 30 feet of snow, making it one of the most seasonal parks in the system and limiting peak access to July through September.

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