15 – Mammoth Cave: A 10,000-Year-Old Maze Beneath the Earth
Where is it? Hidden in Kentucky’s Mammoth Cave National Park (USA) lies the world’s longest cave system—Mammoth Cave. This underground maze stretches over 676 kilometers, but scientists say there’s still more to discover! Ancient Secrets of Indigenous People 5,000 years ago, Native Americans found the cave. They mined minerals, buried their dead, and left torch […]
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