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"The remains of 16 hardened mud structures recently discovered in the mountains northwest of Denver may prove to be the oldest-known buildings in North America. Found during construction of a pipeline, the remains are 4,000 to 7,000 years old, compared with 4,700 years for the oldest Egyptian pyramid."
http://www.science-frontiers.com/sf023/sf023p01.htm
http://www.science-frontiers.com/sf023/sf023p01.htm