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Lassen Volcanic, United States
Lassen Volcanic National Park is one of the few places on Earth where all four types of volcanoes — shield, composite, cinder cone, and plug dome — can be found. Lassen Peak last erupted in 1914-1917, making it the most recent volcanic eruption in the Cascades before Mount St. Helens in 1980. The park's hydrothermal areas, including Bumpass Hell, feature boiling pools, fumaroles, and mud pots fed by volcanic heat beneath the surface.
explore by interest
Stay on boardwalks in hydrothermal areas — the thin crust can break through to scalding water below. The main park road typically opens fully by July.
July through October for full road access. Wildflowers peak in July and August. Snow lingers at higher elevations into June.