Built in 1878 by Marion Ridgeway and called the Door Prairie Barn.

The barn sits east of highway 35 surrounded by woods and cultivated fields.

The post and beam frame sits on wooden sill propped on stone.

[2] The barn faces north and has a large sliding door located off center to the west on the lower level.

The dormer is capped by a steeply pitched gable roof with exposed rafters.

The county was named because of a natural "door" between the woods to the north and east and the prairie to the west and south.

Symmetrically from this northern bay are eight equally spaced stalls, each with a gate at the barn's center and containing a door and window on the outer wall.

At each of the points of intersection of the inner stall walls are large posts that extend to an overhead beam, which braces the floor joists of the upper level.