Massive canyon walls ascend toward a brilliant blue sky. To experience Zion, you need to walk among the towering cliffs, or challenge your courage in a small narrow canyon. These unique sandstone ... more 
Massive canyon walls ascend toward a brilliant blue sky. To experience Zion, you need to walk among the towering cliffs, or challenge your courage in a small narrow canyon. These unique sandstone cliffs range in color from cream, to pink, to re less 
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LiveScience.com | Photo By National Park Service
Fri, Aug 23, 2013 1:40 PM EDT