"Mesa Verde, Colorado, USA.  Native American mud brick pueblo structures occupy the ""Spruce Tree House"" cave at Mesa Verde National Park.  The cliff dwellings at Mesa Verde were built by ancestral puebloans in the period A.D. 600 to A.D. 1300. © Rick Collier<br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> US USA Colorado Mesa Verde cliff dwelling pueblo Spruce Tree House Native American village town structure cave woods forest cave dwelling ancestral puebloan Anasazi"
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