Tucked deep in the Siskiyou Mountains of southern Oregon, Oregon Caves National Monument & Preserve is one of the most unique national park sites in the Pacific Northwest. 🦇🌲 Formed by acidic rainwater dissolving ancient marble, these caves are over 3 million years old and feature narrow passages, swirling calcite formations, and cool temps year-round (around 44°F inside). Unlike many caves, Oregon Caves are marble, not limestone—making them geologically rare in the U.S. Above ground, the pres

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