1 Best Sight in Grand Canyon National Park, Arizona

West of the town of Marble Canyon are these spectacular cliffs, more than 3,000 feet high in many places. A four-wheel-drive vehicle is required here, as there are no paved roads and the sand is deep. Keep an eye out for condors; the giant endangered birds were reintroduced into the area in 1996. Reports suggest that the birds, once in captivity, are surviving well in the wilderness.