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The Anna Miller Museum Building was originally a stable and residence constructed for the National Guard's horses and caretaker. Constructed between 1933 and 1936, the building is one story tall with a rock faced exterior of native sandstone laid in courses. The stone work was done by the Sundstrom Brothers, craftsmen from the area. These same stone masons cut and laid the stone for the construction of the Weston County Court House. The building is significant for its association with and representation of the National Guard's important role in the community of Newcastle and in Wyoming history. The Newcastle National Guard unit has historically made significant contributions to the broad patterns of Newcastle's economic and social stability. The National Guard continued its service to the community by permitting the Weston County Historical Society to use the stables as a museum in 1966. It is the last National Guard cavalry stable known to exist in Wyoming.