The Gladden Windmill was added to the National Register of Historic Places in 1973.
The windmill was built in 1890 and is a well preserved example of a vertical wind turbine built during the 19th century. Although no longer operational, the turbine (and associated mill structure) is a rare example of wind power technology in the United States.
It was listed on the National Register of Historic Places in 1973. Since its listing, the windmill has been dismantled and moved . [from Wikipedia]