Zion National Park, Utah. Both Zion,leaving behind stunning, unique arrays of rock formations

Hikers make their way to Sunset Point from Thors Hammer Sunday, Sept., 6, 2009, in Bryce Canyon National Park, Utah. Both Zion and Bryce were formed millions of years ago when the Earth's crust violently heaved, leaving behind stunning, unique arrays of rock formations.



Hikers pause in the heart of Wall Street at Bryce Canyon Sunday, Sept., 6, 2009, in Bryce Canyon National Park, Utah. Both Zion and Bryce were formed millions of years ago when the Earth's crust violently heaved, leaving behind stunning, unique arrays of rock formations



Hikers make their way along the Riverside Walk Trail beside the Virgin River Saturday, Sept., 5, 2009, in Zion National Park, Utah. Both Zion and Bryce were formed millions of years ago when the Earth's crust violently heaved, leaving behind stunning, unique arrays of rock formations

Hikers enjoy the cool waters of the Upper Emerald Pool at the end of the Upper Emerald Pool Trail Friday, Sept., 4, 2009, in Zion National Park, Utah. Both Zion and Bryce were formed millions of years ago when the Earth's crust violently heaved, leaving behind stunning, unique arrays of rock formations. (AP Photo/Ross D. Franklin

A scenic view from the Emerald Pools Trails looking east Friday, Sept., 4, 2009, in Zion National Park, Utah. Both Zion and Bryce were formed millions of years ago when the Earth's crust violently heaved, leaving behind stunning, unique arrays of rock formations.