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Ancestral Pueblo people thrived in what is now Bandelier National Monument near Los Alamos 10,000 years ago. The park covers 33,677 acres and centers around Frijoles Canyon, where a mile-long hike takes visitors past petroglyphs and masonry walls built into a cliff face. The Ancestral Puebloans left Frijoles sometime after 1250, for reasons still unknown.

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Bandelier National Monument

Ancestral Pueblo people thrived in what is now Bandelier National Monument near Los Alamos 10,000 years ago. The park covers 33,677 acres and centers around Frijoles Canyon, where a mile-long hike takes visitors past petroglyphs and masonry walls built into a cliff face. The Ancestral Puebloans left Frijoles sometime after 1250, for reasons still unknown.