Millstone Bluff is a natural bluff in Pope County, Illinois, United States, located near the community of Glendale. Listed on the National Register of Historic Places because of its archaeological significance, Millstone Bluff is one of three National Register sites in Pope County, along with the Golconda Historic District and part of the Kincaid Mounds State Histo…Millstone Bluff is a natural bluff in Pope County, Illinois, United States, located near the community of Glendale. Listed on the National Register of Historic Places because of its archaeological significance, Millstone Bluff is one of three National Register sites in Pope County, along with the Golconda Historic District and part of the Kincaid Mounds State Historic Site.
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