Escape to this national park in Washington state and surround yourself with mountains, glaciers and streams. Grizzly bears are among the 75 mammal species that inhabit the wilderness.

Backpacking is popular at North Cascades and trips can range from an overnight on relatively level land to multiday hikes over multiple mountain passes. Mountaineering treks for varying skill levels are an option, too, but this is not a beginner's venture.

Beaver Loop trail is a moderate, forested route. The 34.2 mile journey offers a side trip with views of Challenger glacier and peak and usually takes three to four days.

The park service lists authorized guides for North Cascades backpacking on its site.