A bank barn is a type of agricultural building commonly found in hilly or sloped areas. Its design features a lower level that is partially built into the hillside, allowing easy access for livestock and equipment. The upper level is typically used for storing hay and grain, making it efficient for farmers. These barns often have large doors on both levels, facilitating movement between the upper and lower areas. The unique construction helps protect the barn from harsh weather and provides natural insulation. Bank barns are a significant part of rural architecture, especially in regions like Pennsylvania and New England.