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Formation called Agate Mesa, viewed from a group of petrified wood in the foreground, Petrified Forest National Park, Arizona, United States of America, North America

Panorama of three hoodoos shaped like kings, on the edge of the Blue Mesa in Petrified Forest National Park, Arizona, United States of America, North America

Panorama of Tsu'Vo Buttes in Homolovi State Park, Tsu'Vo is a Hopi word meaning Path of Rattlesnakes, Arizona, United States of America, North America

View from the Saddle Mountain Overlook on the northeast edge of Grand Canyon North Rim and the Kaibab National Forest, Arizona, United States of America, North America

Lonely Dell Ranch Corral at Vermilion Cliffs National Monument near the Glen Canyon Recreation Area, Arizona, United States of America, North America

Bend in Colorado River near Lee's Ferry, Glen Canyon Recreation Area, Vermilion Cliffs National Monument in background, Arizona, United States of America, North America

One of three ponds called the Hearst Tanks, on Grand Canyon South Rim, located one mile east of Grandview Point, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Craggy rock spires overlooking South Rim Gorge, an area between Hance Canyon and the Sinking Ship, which is right of center in the distance, southern most part of Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

East slopes of Haystack Mesa in Petrified Forest National Park, Arizona, United States of America, North America

The Hermit Road Transfer Station Bus Stop and entry gate at Grand Canyon South Rim, Arizona, United States of America, North America

An outcrop of rock overlooking the Bright Angel Trail below at Grand Canyon South Rim off Hermit Road, Grand Canyon, UNESCO World Heritage Site, Arizona, United States of America, North America

Steel picnic table along the rim trail overlooking Grand Canyon South Rim off Hermit Road halfway between Monument Creek Vista and The Abyss, Grand Canyon, Arizona, United States of America, North America

The paved Greenway trail west of Monument Creek Vista with a sign warning cyclists of a steep gradient ahead, Grand Canyon, Arizona, United States of America, North America

Closeup of the historic Agate House in Petrified Forest National Park, Arizona, United States of America, North America

A warning sign to stay on the trail to the historic Agate House in Petrified Forest National Park, Arizona, United States of America, North America

A scenic overlook on the west side of the Giant Logs Trail at Petrified Forest National Park, Arizona, United States of America, North America

A scenic overlook on the west side of the Giant Logs Trail at Petrified Forest National Park, Arizona, United States of America, North America

A deep canyon eroded thru the hills of purple and gray bentonite clay near Hamilili Point on the south end of Petrified Forest National Park, Arizona, United States of America, North America

View of a bentonite hill along the Long Logs Trail in Petrified Forest National Park, Arizona, United States of America, North America

Islands of Rock in Hamilili Valley on the south end of Petrified Forest National Park, Arizona, United States of America, North America

A lone hoodoo rock on the edge of a ridge overlooking the Jim Camp Wash on the south end of Petrified Forest National Park, Arizona, United States of America, North America

Crumbling cliffs of a mesa near Hamilili Point in Petrified Forest, Arizona, United States of America, North America

The swirl of stars in the night sky over Grand Canyon South Rim viewed from Navajo Point with the historic Watchtower in the distance on the right, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Western Screech-Owl (Megascops kennicottii) in captivity, Arizona Sonora Desert Museum, Tucson, Arizona, United States of America, North America

An interior view of the historic Desert View Watchtower at Grand Canyon South Rim, artwork created by Fred Kobotie in 1933, now owned by the National Park Service, Arizona, United States of America, North America

Stairs going down from the fourth floor in the historic Desert View Watchtower at Grand Canyon South Rim, UNESCO World Heritage Site, Arizona, United States of America, North America

Southwest view of Grand Canyon South Rim Arizona from the top floor of the historic Watchtower, taken through glass window, Grand Canyon, UNESCO World Heritage Site, Arizona, United States of America, North America

Northwest view of Grand Canyon South Rim Arizona from the top floor of the historic Watchtower, taken through glass window, Grand Canyon, UNESCO World Heritage Site, Arizona, United States of America, North America

The top floor of the historic Watchtower at Grand Canyon South Rim, Grand Canyon, UNESCO World Heritage Site, Arizona, United States of America, North America

The observation deck of the Desert View Watchtower at Grand Canyon South Rim, UNESCO World Heritage Site, Arizona, United States of America, North America

The upper half of the Desert View Watchtower viewed from the observation deck at Grand Canyon South Rim, UNESCO World Heritage Site, Arizona, United States of America, North America

The Colorado River winds through the sheer cliffs of Marble Canyon, south of the Grand Canyon, Arizona, United States of America, North America

Upper Antelope Canyon, Tse' bighanilini, LeChee Chapter, Navajo Nation, Arizona, United States of America, North America

Abstract details of orange slot canyon wall, Antelope Canyon X, Page, Arizona, United States of America, North America

Abstract details of orange slot canyon walls, Antelope Canyon X, Page, Arizona, United States of America, North America

Grand Canyon, Pima Point, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

The Little Teepees on the north side of Haystack Mesa in Petrified Forest National Park, Arizona, United States of America, North America

A shallow cave carved out of a cliff wall below the Blue Mesa in Petrified Forest National Park, Arizona, United States of America, North America

Crystal Mesa above Crystal Creek west of Hamilili Point in Petrified Forest National Park, Arizona, United States of America, North America

Male Costa's hummingbird (Calypte costae), in Bahia Concepcion, Baja California Sur, Sea of Cortez, Mexico, North America

Male magnificent hummingbird (Eugenes fulgens) in flight, Madera Canyon, Coronado National Forest, Arizona, United States of America, North America

Adult brown pelicans (Pelecanus occidentalis), in formation in flight, Puerto Gatos, Baja California Sur, Mexico, North America

The pedestal of Eagle Nest Rock in Jasper Forest Petrified Forest National Park, the rock fell down in 1941 due to heavy rain, Arizona, United States of America, North America

View of Cathedral Rock in Sedona from the middle of Oak Creek, Arizona, United States of America, North America

A large wall of fractured Granite along a trail in Constellation Park in Prescott called The Lost Wall, Arizona, United States of America, North America

Sunrise on saguaro cactus in bloom (Carnegiea gigantea), Sweetwater Preserve, Tucson, Arizona, United States of America, North America

Rock formations, Monument Valley, Navajo Tribal Park, Arizona, United States of America, North America

Lights and shadows in Upper Antelope Canyon, Navajo Tribal Park, Arizona, United States of America, North America

Ray of light through Upper Antelope Canyon, Navajo Tribal Park, Arizona, United States of America, North America

Sandstone buttes in Monument Valley Navajo Tribal Park on the Arizona-Utah border, United States of America, North America

Reflections of Courthouse Butte in the Slick Rock Bowls along the Llama Trail in Sedona, Arizona, United States of America, North America

Panorama of Walnut Canyon, once inhabited by the Sinagua People, located east of Flagstaff, Arizona, United States of America, North America

The Salt River Canyon, hazy view as smoke in the air from wildfire in the area, north of Globe, Arizona, United States of America, North America

View of Sunset Crater Volcano from the east slope of the Lenox Crater Trail, the dark gray soil is volcanic pumice, Arizona, United States of America, North America

Panorama view of O'Leary Peak on the left and Sunset Crater on the right from the Bonito Lava Field near Flagstaff, Arizona, United States of America, North America

A rocky pile in Petrified Forest National Park called Newspaper Rock, where some rocks have petroglyphs, Arizona, United States of America, North America

HDR composite of the late day sun shining through the trees of the Kaibab Forest near Williams, Arizona, United States of America, North America

Water eroded Navajo Sandstone forms a slot canyon in Upper Antelope Canyon, Navajo Land, Arizona, United States of America, North America

Water eroded Navajo Sandstone forms a slot canyon in Upper Antelope Canyon, Navajo Land, Arizona, United States of America, North America

Water eroded Navajo Sandstone forms a slot canyon in Upper Antelope Canyon, Navajo Land, Arizona, United States of America, North America

Sand Castle formations on the edge of the Red Basin in Petrified Forest National Park, Arizona, United States of America, North America

Skip Brown paddles his whitewater kayak through rapids on the Colorado River through the Grand Canyon, Arizona, United States of America, North America

A sheer cliff of rock jutting out from the Blue Mesa along the Billings Gap Trail in Petrified Forest National Park, Arizona, United States of America, North America

Field of hoodoos in Goblin Garden in the Flat Tops of Petrified Forest National Park, Arizona, United States of America, North America

Wide angle view of Glen Canyon Dam from the wavy sandstone mesa of an area called the Chains, Arizona, United States of America, North America

Lee's Ferry Road running between Cathedral Rock and Vermilion Cliffs National Monument in Glen Canyon Recreation Area, Arizona, United States of America, North America

A storm passes through the Grand Canyon during a summer day, Tusayan, Arizona, United States of America, North America

Horseshoe Bend in the Glen Canyon Recreation Area at sundown, near Page, Arizona, United States of America, North America

Bright Angel Trail at Grand Canyon South Rim viewed from the Trailview Overlook along Hermit Road, Grand Canyon, UNESCO World Heritage Site, Arizona, United States of America, North America

A bench along the rim trail overlooking Grand Canyon South Rim off Hermit Road, Grand Canyon, UNESCO World Heritage Site, Arizona, United States of America, North America

Stairway leading down to the Trailview Overlook East Vista at Grand Canyon South Rim, off Hermit Road, Grand Canyon, UNESCO World Heritage Site, Arizona, United States of America, North America

Stairway leading down to the Trailview Overlook East Vista at Grand Canyon South Rim, off Hermit Road, Grand Canyon, Arizona, United States of America, North America

Stairway leading down to the Trailview Overlook East Vista at Grand Canyon South Rim, off Hermit Road, Grand Canyon, Arizona, United States of America, North America

A view of Grand Canyon from the west side of Maricopa Point, Grand Canyon, UNESCO World Heritage Site, Arizona, United States of America, North America

A sign marking the one way entrance to Mohave Point off of Hermit Road, Grand Canyon, UNESCO World Heritage Site, Arizona, United States of America, North America

The safety rails of the Great Mohave Wall Overlook at Grand Canyon, Arizona, United States of America, North America

The paved Greenway Trail that runs between Hermits Rest and Pima Point at Grand Canyon, Arizona, United States of America, North America

View of Waldron Canyon southwest of Hermit Canyon in winter, accessible via Hermit Trail, Grand Canyon, Arizona, United States of America, North America

Purple badlands of bentonite near Hamilili Point on the south end of Petrified Forest National Park, Arizona, United States of America, North America

A petrified tree log that has shattered over time, located on a mesa near Hamilili Point on the south end of Petrified Forest National Park, Arizona, United States of America, North America

The paved path, that used to be an old road, leading to the Long Logs Trail and Agate House in Petrified Forest National Park, Arizona, United States of America, North America

A dry waterfall on the west side of Hamilili Point, Hamilili being a Zuni word for petrified wood, next to a hoodoo on the south end of Petrified Forest National Park, Arizona, United States of America, North America

A small hill of gray bentonite clay that appears to be melting into the purple bentonite of Hamilili Valley on the south end of Petrified Forest National Park, Arizona, United States of America, North America

View from Cape Royal, below is Vishnu Creek running between Vishnu Temple on the left with Wotans Throne on the right at twilight with the Moon rising, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

The North Valley below the Blue Mesa in Petrified Forest National Park, Arizona, United States of America, North America

Bighorn sheep petroglyph, Petrified Forest National Park, Arizona, United States of America, North America

Giant saguaro cactus (Carnegiea gigantea) at dawn in the Sweetwater Preserve, Tucson, Arizona, United States of America, North America

Lights and shadows at Lower Antelope Canyon, Navajo Tribal Park, Arizona, United States of America, North America

Panorama of the Sinking Ship and Coronado Butte on the south rim of the Grand Canyon, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Watch Tower on Grand Canyon South Rim at twilight, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

A Texas Roadside Skipper feeding on a wildflower in Arizona, United States of America, North America

A ghostly stone building, historical landmark, one of the last original structures of Old Salome, Arizona, United States of America, North America

Stone pillars overlooking Papago Creek Canyon on the south rim of the Grand Canyon, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

A northeast panorama of the Grand Canyon from Shoshone Point at sundown, with Shoshone Rock on the right, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Rolling hills and golden Gramma Grass of Chino Valley, located along East Perkinsville Road just east of State Route 89, Arizona, United States of America, North America