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🪨 South Dakota Has a Hidden “Underworld” of Caves That Stretch for Hundreds of Miles

Beneath the Black Hills lies one of the largest cave systems on Earth — Jewel Cave, with more than 220 miles of mapped passages, and Wind Cave, one of the world’s oldest and densest. Scientists believe vast sections remain undiscovered, possibly doubling its known size.

These caves form a massive underground maze carved by ancient water systems millions of years ago — and explorers are still finding new chambers every year.