Gitchie Manitou State Preserve - Sioux Falls,South Dakota

Incredible place historically.  Occupied by the Oneota American Indians in the late 1600's and later the Yankton Sioux American Indians until the early 1900's, this continual American Indian occupation was a ceremonial place covered in large boulders that were thought to have healing
properties.  Large boulders survive to this day with the "dimples"
in the rock caused from the American Indian's tapping instruments into
the rock and then grinding the chips of the boulder into powder to me
mixed with other herbs and grasses as medicine.  At one time it
was believed that in excess of 10,000 American Indians occupied this
site.  Some excavations have discovered human projectile points
dating back over 8500 years old.