Claim: The Holtkamp Round Barn (which was built in 1918) is a historic building located near Salem in rural Henry County, Iowa, United States, and has been listed on the National Register of Historic Places since 1986.
Evidence: It was built in 1918 by its first owner B.J. The Holtkamp Round Barn is an historic building located near Salem in rural Henry County, Iowa, United States. June 30, 1986