Rob Tilley / Petroglyphs on cliff near Colorado River, Moab, Utah, USA, January 2008
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Jerry Monkman / Ancestral Puebloan pictographs of hands in the Needles District. Canyonlands National Park, Utah, USA
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Jerry Monkman / Ancestral Puebloan pictographs of hands in the Needles District. Canyonlands National Park, Utah, USA
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Jerry Monkman / Ancestral Puebloan pictographs of hands in the Needles District. Canyonlands National Park, Utah, USA
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Philippe Clement / Ancient petroglyphs near Puerco Pueblo made by ancestral Puebloan people showing anthropomorphs (human-like figures) and zoomorphs (animal-like figures), Petrified Forest National Park, Arizona, USA
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Tim Fitzharris / Hovenweep Castle at Little Ruin Canyon on sandstone cliff, Hovenweep National Monument, Utah
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Tim Fitzharris / Hovenweep Castle at Little Ruin Canyon on sandstone cliff, Hovenweep National Monument, Utah
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Tim Fitzharris / Hovenweep Castle at Little Ruin Canyon, Hovenweep National Monument, Utah
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Yva Momatiuk & John Eastcott / Stonework of ruins of monumental public buildings called Pueblo Bonito, ancestral Puebloan culture, AD 850-1250, Chaco Canyon, Chaco Culture National Historical Park, New Mexico
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Yva Momatiuk & John Eastcott / Ruins of monumental public buildings called Pueblo Bonito, ancestral Puebloan culture, AD 850-1250 Chaco Canyon, Chaco Culture National Historical Park, New Mexico
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Yva Momatiuk & John Eastcott / Ruins of monumental public buildings called Pueblo Bonito, ancestral Puebloan culture, AD 850-1250 Chaco Canyon, Chaco Culture National Historical Park, New Mexico
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Yva Momatiuk & John Eastcott / Stonework of ruins of monumental public buildings called Pueblo Bonito, ancestral Puebloan culture, AD 850-1250, Chaco Canyon, Chaco Culture National Historical Park, New Mexico
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Yva Momatiuk & John Eastcott / Stonework of ruins of monumental public buildings called Pueblo Bonito, ancestral Puebloan culture, AD 850-1250, Chaco Canyon, Chaco Culture National Historical Park, New Mexico
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Yva Momatiuk & John Eastcott / Ruins of monumental public buildings called Pueblo Bonito, ancestral Puebloan culture, AD 850-1250 Chaco Canyon, Chaco Culture National Historical Park, New Mexico
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Yva Momatiuk & John Eastcott / Ruins of monumental public buildings called Pueblo Bonito, ancestral Puebloan culture, AD 850-1250 Chaco Canyon, Chaco Culture National Historical Park, New Mexico