It has been used as the Anna Miller Museum by the Weston County Historical Society since 1966.

The Newcastle National Guard unit was formed in 1899 as Company A, Second Regiment, Wyoming National Guard, becoming Company A of the Third Wyoming Infantry Regiment in 1905.

Footings were started, but due to the onset of World War II the hall was never completed.

Stone intended for the hall was appropriated for other local construction projects.

Stonework was by the Sundstrom Brothers, who also worked on the Weston County Courthouse.