Lost during 1960s

755th Aircraft Control and Warning Squadron (Walworth County, Wisconsin)
Location of a former Cold War radar station, now an industrial park
American League Birthplace (Milwaukee County, Wisconsin)
Birthplace of the American League
Old Hart County Courthouse (Hart County, Georgia)
Old courthouse building destroyed by fire
Ridge Theater (Hamilton County, Ohio)
Though largely undisturbed from the outside, the Ridge looks to have been closed for a long time.
The Salt Works (Orange County, California)
History of former salt works in the Newport Back Bay.