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National parks 20

National parks 20

A red sandstone formation named 'Elephant Rock' is pictured at the Valley of Fire State Park in Carson City, Nevada, on Apr. 20, 2009. The Valley of Fire State Park, which is located only six miles from Lake Mead and 55 miles northeast of Las Vegas, derives its name from red sandstone formations, shaped from great shifting sand dunes during the age of dinosaurs, 150 million years ago. Complex uplifting and faulting of the region, followed by extensive erosion, have created the present landscape. (Jewel Samad/AFP/Getty Images)

JEWEL SAMAD