A bank barn is a type of agricultural building commonly found in the northeastern United States. It is built into the side of a hill or bank, allowing for easy access to the upper and lower levels. The design typically features a large, open space for livestock or storage, with a ramp or driveway leading to the upper level. This structure is advantageous for farmers as it provides natural ventilation and drainage. The lower level is often used for housing animals or storing equipment, while the upper level can be used for hay or grain storage. The unique design maximizes space and efficiency on a farm.