#18: Long Valley Caldera (California, ~760,000 BCE)
Before humanity’s dawn, Long Valley exploded with a force that redefined continents. Ash blanketed most of North America, drifting as far as the Atlantic. Entire mountain ranges quaked and rivers rerouted. It was one of Earth’s greatest eruptions — a prelude to Yellowstone’s fury. Today, the caldera still breathes: boiling springs,

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shifting ground, and restless tremors speak of power not spent but waiting.
