5. Zion Narrows - Zion National Park, Utah, United States

Occasionally, hiking trails require one to get a little wet while crossing a small stream or brook, but it's a different story when hiking the Zion Narrows. This 16-mile trail is along a slot canyon, which means a significant portion of the hike is in a river. The Narrows can seem like a maze as hikers snake through the vertical red cliffs and stumble upon waterfalls and moss-covered geological formations. Adventure seekers looking to do the entire trail can either hike from the bottom up in one day, or apply for an overnight backpacking license and tackle the trail from the top while spending the night under the starry, desert sky.
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