The Miamisburg Mound is the highest and largest of the many conical burial mounds in Ohio. Erected in prehistoric times by the so-called Mound Builders, it stands as an imposing memorial to those first Ohioans. The mound is 70 feet in height, 877 feet in circumference at the base, covers approximately one and one-half acres, and is estimated to contain 54,000 cubic yards of earth. The land included in this state monument was donated to the Ohio Archaeological and Historical Society by Charles Franklin Kettering of Dayton, Ohio. This glacial boulder was moved from the farm upon which Mr. Kettering was born, near Loudenville, Ashland County, Ohio.