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Oklahoma: Covered constructed Hillock at Spiro Mounds
Wikipedia: "Spiro Mound Group
U.S. National Register of Historic Places
Spiro Mounds is located in Oklahoma
Nearest city: Spiro, Oklahoma
Coordinates: 35°18′43.72″N 94°34′7.89″WCoordinates: 35°18′43.72″N 94°34′7.89″W
Area: Le Flore County
Architectural style: Mississippian
NRHP Reference#: 69000153
Added to NRHP: September 30, 1969
Spiro Mounds is an important pre-Columbian Caddoan Mississippian culture archaeological site located in present-day eastern Oklahoma in the United States. The site it located seven miles north of Spiro and is the only prehistoric Native American archaeological site in Oklahoma open to the public. The prehistoric Spiro people thrived and created a strong religious center and political system. The site was eventually abandoned after several hundred years of occupation, although it is still unclear why."