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Sandstone formations, Coyote Buttes Wilderness, Vermilion Cliffs National Monument, Arizona, United States of America, North America
Caves in the cliff walls, used to store food by ancient Anasazi Indians, Canyon De Chelly National Monument, Arizona, United States of America, North America
The Painted Hills, listed as one of the Seven Wonders of Oregon, John Day Fossil Beds National Monument, Oregon, United States of America, North America
Sipapu Natural Bridge, Natural Bridges National Monument, Utah, United States of America, North America
White Sands National Monument, New Mexico, United States of America, North America
Road leading through the Grand Staircase Escalante National Monument, Utah, United States of America, North America
Organ pipe cactus (Stenocereus thurberi), Organ Pipe Cactus National Monument, Sonoran Desert, Arizona, United States of America, North America
A Mexican jay (Aphelocoma wollweberi), in a tree in the Chiricahua National Monument, Arizona, Arizona, United States of America, North America
Silouetted sandstone formation at dawn, Coyote Buttes Wilderness, Vermilion Cliffs National Monument, Arizona, United States of America, North America
Joshua Tree National Monument, California, United States of America, North America
Joshua Tree National Monument, California, United States of America, North America
Grand Staircase Escalante National Monument, Utah, United States of America, North America
Devil's Tower reflected in a stream, Devil's Tower National Monument, Wyoming, United States of America, North America
A sedimentary Pipe, Angel's Palace trail, Kodachrome Basin State Park, Grand Staircase-Escalante National Monument, Kane County, Utah, United States of America, North America
Tent Rocks, Kasha-Katuwe Tent Rocks National Monument, New Mexico, United States of America, North America
From Monument Creek Vista, South Rim, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America
Badlands with yellow, tan, and purple dirt, Vermilion Cliffs National Monument, Arizona, United States of America, North America
View over the sandstone cliffs of the Grand Staircase Escalante National Monument, Utah, United States of America, North America
Sandstone formations and rock with clouds, Coyote Buttes Wilderness, Vermilion Cliffs National Monument, Arizona, United States of America, North America
Castillo San Marcos National Monument, St. Augustine, Florida, United States of America, North America
Joshua Tree National Monument, California, United States of America, North America
Owachomo Natural Bridge, Natural Bridges National Monument, Utah, United States of America, North America
Sipapu Natural Bridge, Natural Bridges National Monument, Utah, United States of America, North America
Pueblo Bonito, Chaco Canyon National Monument, New Mexico, United States of America, North America
Detail from the dramatic landscape of the Painted Hills, where rapid erosion has shaped colourful mineral-rich clays, John Day Fossil Beds National Monument, Oregon, United States of America, North America
Yucca bloom in Gypsum dunes, White Sands National Monument, New Mexico, United States of America, North America
Sand dunes, Death Valley National Monument, California, United States of America, North America
Kivas, Pueblo Bonito dated at 1000-1100 AD, Anasazi site, Chaco Canyon National Monument, New Mexico, United States of America (U.S.A.), North America
Kivas and rooms, foreground rock fall destroyed part of pueblo, Pueblo Bonito 1000-1100 AD, Anasazi site, Chaco Canyon National Monument, New Mexico, United States of America (U.S.A.), North America
Yellow flowering plants and loop road seen from Inferno cone, Craters of the Moon National Monument, Idaho, United States of America (U.S.A.), North America
Spirit Lake in the landscape north of Mount St. Helens devastated by the 1980 eruption, Mount St. Helens National Volcanic Monument, Washington State, United States of America (U.S.A.), North America
Petroglyphs, Chaco Canyon National Monument, New Mexico, United States of America, North America
Rock strata in cliffs in Paria River Valley, Grand Staircase-Escalante National Monument, near Page, Arizona, United States of America, North America
Yucca elata plant at the White Sands National Monument, the world's largest gypsum dunefield, New Mexico, United States of America, North America
White Sands National Monument, world's largest gypsum dunefield, New Mexico, United States of America, North America
White Sands National Monument, world's largest gypsum dunefield, New Mexico, United States of America, North America
White Sands National Monument, world's largest gypsum dunefield, New Mexico, United States of America, North America
Fossilised bones including hind leg of Sauropod and Apatosaurus, Dinosaur National Monument, Colorado and Utah, United States of America, North America
Sand dunes, Death Valley National Monument, California, United States of America, North America
Cannon battery at Historic Fort Sumter National Monument, Charleston, South Carolina, United States of America, North America
Gordon's Bladderpod (Lesquerella gordonii), Organ Pipe Cactus National Monument, Arizona, United States of America, North America
Rancher's Fireweed (Devil's Lettuce) (Common Fiddleneck) (Rancher's Fiddleneck) (Amsinckia menziesii var. intermedia), Organ Pipe Cactus National Monument, Arizona, United States of America, North America
Purple Owl's Clover (Exserted Indian Paintbrush) (Escobita) (Castilleja exserta), Organ Pipe Cactus National Monument, Arizona, United States of America, North America
Fairy Duster (Calliandra eriophylla), Organ Pipe Cactus National Monument, Arizona, United States of America, North America
Petroglyph National Monument, petroglyphs carved into volcanic rock by American Indians 400 to 700 years ago, New Mexico, United States of America, North America
National WWI Museum and Memorial of the United States in Kansas City, Missouri, United States of America, North America
Natural Bridges National Monument, Sipapu Bridge, Utah, United States of America, North America
Petroglyph National Monument, petroglyphs carved into volcanic rock by American Indians 400 to 700 years ago, New Mexico, United States of America, North America
Thousands of trees blown down by the 1980 eruption still floating on Spirit Lake north of the mountain, Mount St. Helens National Volcanic Monument, Washington State, United States of America (U.S.A.), North America
Petroglyph National Monument, petroglyphs carved into volcanic rock by American Indians 400 to 700 years ago, New Mexico, United States of America, North America
Petroglyph National Monument, petroglyphs carved into volcanic rock by American Indians 400 to 700 years ago, New Mexico, United States of America, North America
Natural Bridges National Monument, Sipapu Bridge, Utah, United States of America, North America
Cabrillo Statue, Cabrillo National Monument, Point Loma, San Diego, California, United States of America, North America
Lava dome in crater seen from rim, Mount St. Helens after 1980 eruption, with Spirit Lake and Mount Rainier in the distance, Mount St. Helens National Volcanic Monument, Washington State, United States of America (U.S.A.), North America
Ryan Lake and some of the millions of trees north of Mount St. Helens flattened by the eruption of 1980, Mount St. Helens National Volcanic Monument, Washington State, United States of America (U.S.A.), North America
Old Point Loma lighthouse on the Cabrillo National Monument, Point Loma, San Diego, California, United States of America, North America
View over San Diego Bay from the Cabrillo National Monument, Point Loma, San Diego, California, United States of America, North America
Cannon battery at Historic Fort Sumter National Monument, Charleston, South Carolina, United States of America, North America
Bandelier National Monument, New Mexico, United States of America, North America
Badlands from Zabriskie Point, looking west, Death Valley National Monument, California, United States of America (U.S.A.), North America
Rippled gypsum, sand dunes in the White Sands National Monument, New Mexico, United States of America, North America
Part of the 150 square miles of forest north of Mount St. Helens flattended by the huge eruption of 1980, Mount St. Helens National Volcanic Monument, Washington State, United States of America (U.S.A.), North America
Fort Sumter National Monument, Charleston, South Carolina, United States of America, North America
Patterns in the dunes, White Sands National Monument, New Mexico, United States of America, North America
Cannon battery at Historic Fort Sumter National Monument, Charleston, South Carolina, United States of America, North America
Sandstone layers, Vermillion Cliffs National Monument, Arizona, United States of America, North America
Cabrillo statue, Cabrillo National Monument, Point Loma, San Diego, California, United States of America, North America
Dead trees in the Mount St. Helens National Volcanic Monument in Washington State, United States of America, North America
Devil's Tower National Monument, Wyoming, United States of America, North America
Devil's Tower National Monument, Wyoming, United States of America, North America
Devil's Tower National Monument, Wyoming, United States of America, North America
Cedar Breaks National Monument, Utah, United States of America, North America
Wagon in Fort Union National Monument, Las Vegas, New Mexico, United States of America, North America
Sipapu Bridge, Natural Bridges National Monument, Utah, United States of America, North America
Hotel del Coronado, National Historic Monument dating from 1891, Coronado, California, United States of America, North America
Hovenweep National Monument, Colorado, United States of America, North America
Devil's Tower National Monument, Wyoming, United States of America, North America
Fort Pulaski National Monument, Savannah, Georgia, United States of America, North America
Joshua Tree National Monument, California, United States of America, North America
Bandelier National Monument, New Mexico, United States of America, North America
Hovenweep National Monument, Colorado, United States of America, North America
Cedar Breaks National Monument, Utah, United States of America, North America
Joshua Tree National Monument, California, United States of America, North America
Bandelier National Monument, New Mexico, United States of America, North America
Petroglyph of male figure carved 1000 years ago by Fremont Native American people in the iron oxide 'desert varnish' on the sandstone of Cub Creek Valley in this fossil park, Dinosaur National Monument, Utah, United States of America (USA), North America
Petroglyphs carved 1000 years ago by Fremont Native American people in the iron oxide 'desert varnish' on the sandstone of Cub Creek Valley in this fossil park, Dinosaur National Monument, Utah, United States of America (USA), North America
Petroglyphs carved 1000 years ago by Fremont Native American people in the iron oxide 'desert varnish' on the sandstone of Cub Creek Valley in this fossil park, Dinosaur National Monument, Utah, United States of America (USA), North America
Eroded rock formations, gullies, in differing colours, Artists Palette, Death Valley National Monument, California, United States of America (USA), North America
Fossil bones, Dinosaur National Monument, Quarry Site, Utah, United States of America, North America
Gila Cliff dwellings, Gila National Monument, Silver City, New Mexico, United States of America, North America
Long House, Bandelier National Monument, New Mexico, United States of America, North America
Wukoki pueblo ruins, Wupatiki National Monument, Flagstaff, Arizona, United States of America, North America
Re-enactors, Castillo de San Marcos National Monument, St. Augustine, Florida, United States of America, North America
Toadstool hoodoo, formed by water and wind, grand staircase escalante national monument, utah, usa
Saguaro cacti at sunset, Saguaro National Monument, Tucson, Arizona, United States of America, North America
Wukoki pueblo ruins, Wupatiki National Monument, Flagstaff, Arizona, United States of America, North America
Toadstool hoodoo, formed by water and wind, grand staircase escalante national monument, utah, usa
Wukoki pueblo ruins, Wupatiki National Monument, Flagstaff, Arizona, United States of America, North America
Scotts Bluff National Monument, Nebraska, United States of America, North America
Cabrillo's statue, Cabrillo National Monument, Point Loma, San Diego, California, United States of America, North America