A Pennsylvania barn is a type of banked barn built in the United States from about 1820 - 1900. The style's most distinguishing feature is the presence of an overshoot or forebay, an area where the barn overshoots its foundation. These barns were banked, that is set into a hillside to ensure easy access to both the basement and the level above. Almost all Pennsylvania barns have gable roofs but the forebay and banked nature of the structures easily give them away.[1]
"Some Thoughts About Barns", Charles Harris Whitaker, Journal of the American Institute of Architects,October 1924