In fact, back in the early 1900s, this gaping cave in the middle of Montana was so highly regarded that the federal government considered making it a national park. Shortly before that, it had managed ...

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Beneath the earth, builders carved out a hidden home using nothing but mud, stone, and bare hands. The underground villa feels like a secret retreat lost to time.

In horror movies, underground cave systems can be the stuff of nightmares, but at this Montana state park, they're instead packed full of adventure.