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3029 Spirit Lake Hwy., Castle Rock, WA 98611, United States

This park has seen impressive regrowth since the 1980 eruption, but it’s still full of eerie landscapes and volcanic remnants. Stop at the Castle Rock Visitor Center for hiking information. Strap on your headlamp for the two-mile hike through Ape Cave, the longest continuous lava tube in the Western Hemisphere.

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Mount St. Helens Visitor Center

This park has seen impressive regrowth since the 1980 eruption, but it’s still full of eerie landscapes and volcanic remnants. Stop at the Castle Rock Visitor Center for hiking information. Strap on your headlamp for the two-mile hike through Ape Cave, the longest continuous lava tube in the Western Hemisphere.