The ubiquitous Quonset Hut was developed by the US Navy during World War II to fill their need for lightweight portable multipurpose buildings that could be moved anywhere and assembled quickly with unskilled labor. 150,000 plus were built during the war and many of the sold to the public after the war. They seem to be everywhere in a multitude of uses.
An almost hidden hut just off the Riverwalk in San Antonio. I think it used to be a dance hall but am not sure.
A storage building in Flandreau, South Dakota.