English: Casa Grande Ruins National Monument, located at 1100 West Ruins Road in Coolidge, Pinal County, Arizona, is an archaeological site and ruins of the Pre-Columbian Hohokam culture dating from c.12th century-15th century. "Casa Graade" (Big House) is the Spanish translation of the O'odhamSiwañ Wa'a Ki, Sivan Vahkih or Sivan Vah'Ki, which refers to the largest structure in the monument.
President Benjamin Harrison proclaimed the site to be Casa Grande Reservation on June 22, 1892, becoming the first prehistoric and cultural reserve in the US. President Woodrow Wilson then designated it a national monument on August 3, 1918. The monument is administered by the National Park Service and was added to the National Register of Historic Places in 1966.
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== {{int:filedesc}} == {{Information |Description= {{en|'''{{w|Casa Grande Ruins National Monument}}''', located at 1100 West Ruins Road in Coolidge, Pinal County, Arizona, is an archaeological site and ruins of the Pre-Columbian Hohokam culture dating from c.12th century-15th century. "Casa Graade" (Big House) is the Spanish translation of the O'odham ''Siwañ Wa'a Ki'', ''Sivan Vahkih'' or ''Sivan Vah'Ki...