For many, many visitors, the U.S. National Park System (NPS) is a real wonder. It preserves 85 million acres of land, from historic sites to true wilderness — the largest one of all has over 13 million acres within its boundaries. With over 21,000 miles of trails alone, it's no wonder that the NPS is often considered a shining achievement of all those who made it happen.

But, while you very definitely should get to your closest national park and spend some time in nature, there is also a dark side to the NPS. With so many years in operation and thousands upon thousands of visitors, something scary is bound to happen every once in a while. From mysterious disappearances to adventurers who perhaps never left their beloved wilderness, there's quite a lot to dig into. So while you're planni

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