Prehistoric rock art and abandoned cliff dwellings can be found in the wilderness.
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They build a cup nest in a cavity on a cliff, or re-use abandoned cliff swallow nests.
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According to David Madsen, Utah's state archaeologist, there may be up to five million archaeological sites in the Southwest _ everything from day camps where young Indian boys once left behind broken knives to abandoned cliff-side apartments of the Anasazi.
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