Fodor's Expert Review The Narrows

This sinuous, 16-mile crack in the earth where the Virgin River flows over gravel and boulders is one of the world's most stunning gorges. If you hike through it, you'll find yourself surrounded—sometimes nearly boxed in—by smooth walls stretching high into the heavens. Plan to get wet, and be aware that deadly flash floods can occur here, especially in spring and summer. Always check on the weather before you enter.