The tobacco barn, a type of functionally classified barn found in the USA, was once an essential ingredient in the process of air-curing tobacco. In the 21st century they are fast disappearing from the landscape in places where they were once ubiquitous.[1] The barns have declined with the tobacco industry in general, and U.S. States such as Maryland actively discourage tobacco farming.[1] When the US tobacco industry was at its height, tobacco barns were found everywhere the crop was grown. Tobacco barns were as unique as each area in which they were erected, and there is no one design that can be described as a tobacco barn.