India, March 31 -- Arizona isn't the only state with an impressive canyon. Virginia and Kentucky have the nearly 1,000-foot canyon in Breaks Interstate Park, known as the "Grand Canyon of the South," while Texas boasts what's frequently billed as the second-largest canyon in the entire country: Palo Duro Canyon. This wondrous natural formation-which measures in at 120 miles long, 20 miles wide, and up to 800 feet deep-is known as the "Grand Canyon of Texas," and it's the main draw to Palo Duro Canyon State Park.

While the park opened to the public in 1934, the canyon itself is much, much older. Its formation is said to have started around a million years ago, as the headwaters of the Prairie Dog Town Fork of the Red River carved out its...