Usually, when we think of caves tucked away in a mountainside, the natural dwelling is followed by images of dark, dank and mysterious nature made tunnels. But for one cave in Boulder, Utah, it’s a ...

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In 1879, a landowner and amateur archaeologist named Marcelino Sanz de Sautuola ventured into a newly discovered cave system in northern Spain. Hoping to find prehistoric tools, he kept his eyes fixed ...