Hidden gems: America's 20 least-visited National Monuments
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12. Aztec Ruins, New Mexico( National Park Service )
The self-guided tour of the ruins in Aztec, about 205 miles from Santa Fe, lead through the well-preserved ancient Puebloan "great house" West Ruin, which has the original wood roofing and mortar walls. The reconstructed semi-subterranean Great Kiva, once the central social and religious site for the Native Americans, is among the oldest and largest of its kind. Spring weather at the ruins is especially unpredictable and summers are hot; travel in the fall for best conditions.
Visitors in 2009: 38,234
More info: http://www.nps.gov/azru