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Mount Rainier National Park - Washington

You may be familiar with Mount Rainier National Park in Washington State, renowned for having the most glaciated peak in the mainland United States. Mount Rainier itself is an active volcano, from which five major rivers originate. But don't let the wildflower meadows and teeming wildlife fool you into thinking it doesn’t pose a serious risk to your safety. It is considered one of the most dangerous volcanoes in the world today due to the expectation that a major eruption could occur at any moment, and its relatively close proximity to the Seattle and Portland metropolitan areas.

Shutterstock/Marat Zordinov

To add to that, the sustained steep angle of the Liberty Ridge route on Mount Rainier makes it one of the most dangerous, accounting for a quarter of the park's total climbing fatalities.