Ratcliffe Mound is located in Ohio

The Ratcliffe Mound (33-Vi-3) is a Native American mound in the southeastern part of the U.S. state of Ohio. Located in western Vinton County, it lies to the east of the community of Londonderry,^[3] at the bottom of a steep-walled valley. Sitting in the middle of a pasture field near a stream, the mound is isolated in open countryside; the only nearby tree is a sycamore that grows atop the mound. The mound is a circular cone in shape, 14 feet (4.3 m) high and 86 feet (26 m) in diameter.^[2]

• http://en.wikipedia.org/wiki/Ratcliffe Mound