This yawning gorge in South Dakota's Black Hills is a striking sight in the fall. It stretches out for 19 miles (31km), its rugged walls dropping for 1,000 feet (305m) each side, and the Spearfish Canyon Scenic Byway beats a scenic path through it. Be sure to stop off at natural wonders along the way, such as Bridal Veil Falls, a 60-foot (18m) cascade surrounded by woodland. This time of year the forest is bright with color, from crimson to mustard to burned orange.

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