Hikers descend the curving South Kaibab trail in Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

A cowboy wrangler leads a pack train of horses up the South Kaibab Trail in Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Hikers on the South Kaibab Trail with the extensive Grand Canyon vista extending beyond, Grand Canyon, UNESCO World Heritage Site, Arizona, United States of America, North America

View of O'Neill Butte on the left and Grand Canyon on the right from the edge of Cedar Ridge along the South Kaibab Trail, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Sunrise view from Cedar Ridge along the South Kaibab Trail at Grand Canyon Arizona in winter. O'Neill Butte is on the left and Cremation Creek is below in the center. Ooh Aah Point in on the upper right.

The 11th switchback along the North Kaibab Trail at Grand Canyon North Rim, UNESCO, Arizona, United States of America

Grand Canyon view from Skeleton Point along the South Kaibab Trail on the south rim, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Grand Canyon view from the east side of Skeleton Point along the South Kaibab Trail, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

The South Kaibab Trail winding down to the Black Bridge that spans the Colorado River at Grand Canyon Arizona. Phantom Ranch is just left of center.

Grand Canyon South Rim viewed from Cedar Ridge along the South Kaibab Trail, UNESCO World Heritage Site, Arizona, United States of America, North America

Scenic view of Grand Canyon from Ooh Aah Point on South Kaibab Trail, Grand Canyon National Park, Arizona, USA

View of O'Neill Butte from its north side along the South Kaibab Trail at Grand Canyon Arizona just after sunrise.

Scenic view of Grand Canyon from South Kaibab Trail, Grand Canyon National Park, Arizona, USA

Scenic view of Grand Canyon from South Kaibab Trail, Grand Canyon National Park, Arizona, USA

View of Pipe Creek from the west cliff of Skeleton Point at Grand Canyon Arizona along the South Kaibab Trail.

View of O'Neill Butte from Yaki Point at first morning light, South Kaibab Trail, Bright Angel Canyon and Trail, Grand Canyon National Park, South Rim, Arizona, United States of America, USA

Suspension Bridge Kaibab Suspension Bridge over Colorado River, South Kaibab Trail, Grand Canyon National Park, Arizona, USA, North America

Hiking the Grand Canyon's Kaibab Trail, South Rim. Grand Canyon National Park, Arizona.

Female hiker waits for pack horses to pass on the South Kaibab Trail in Grand Canyon National Park north of Williams, Arizona May 2011. The South Kaibab Trail starts on the south rim of the Colorado Plateau and follows a ridge out to Skeleton Point allowing for 360-degree views of the canyon then down to the Colorado River. At the Colorado River the trail connects with the North Kaibab trail as part of the Arizona Trail system, that crosses the state of Arizona from Mexico to Utah.

Overlooking the Grand Canyon's Kaibab Trail, South Rim. Grand Canyon National Park, Arizona.