The Marion Ridgeway Polygonal Barn located in LaPorte County on the southern edge of LaPorte, Indiana, is a multi-sided barn. 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 nine-sided barn is south of a rectangular barn. The barn has nine-sides and is two-stories tall. The roof is capped with a sectional cone roof with a nine-sided cupola in the Gothic Revival/Italianate style. Within the louvered panels trim pieces resemble a lancet arch. The post and beam frame sits on wooden sill propped on stone.