Take a hike and see prehistoric art at Piney Creek Ravine  

Petroglyphs are images created by removing part of a rock surface by carving or engraving.   In Missouri, Native American petroglyphs can be found at Washington State Park, Thousand Hills State Park, and in a historic archeological site near Holliday, Mo., in Monroe County. One of several places in Illinois where petroglyphs can be found is…

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