Taken at Levi Jackson State Park, London, Kentucky. The "rocks" you see lining the pathway here are millstones and Betsy, Isaac, and Micah are on their way to the little mill at the end of the path.
Here is some info on it: The MacHargue Mill, located on the Little Laurel River was built between 1938 and 1939 and is typical of a Kentucky pioneer mill. The millstones were brought to this site in 1805 from the famous "Wilderness Road".
Thank you Nicole, Connie, Lou Ann, Katy, Henri, Kathy, and Phoebe!
@randystreat Yes, mill stones. I was so tired when I posted this I just put the picture up- but there's a little commentary on it now.