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Located in southwestern Colorado, Mesa Verde National Park was established in 1906 to preserve prehistoric Native American cliff dwellings. It occupies a high tableland area of 52,085 acres (21,078 hectares) and contains hundreds of pueblo ruins up to 13 centuries old, spanning four archaeological periods. The largest and most striking of the multistoried apartments built under overhanging cliffs is Cliff Palace. Excavated in 1909, it contains hundreds of rooms and many kivas, which are what? Discuss
Source: The Free Dictionary