At the eastern end of the Old Stone Fort enclosure, the outer perimeter walls approach each other and swell into terminal mounds, forming the only evident gateway in the walls. This feature includes the opening between the outer walls, a ditch across the opening, and detached, in-turned, parallel mound walls that, when complete, projected over 150 feet within the enclosure. The orientation of the parallel mounds aligns to within one degree of the summer solstice sunrise. The builders of the Old Stone Fort likely used this area for ceremonial activities tied to changing seasons and seasonal resources, and archaeological evidence indicates that it was set apart as a special place and an important gathering place for people along the Duck River for at least 500 years.