Erected in 1844, the Milton House is the first poured grout building in the United States and Wisconsin's only documented Underground Railroad site. In addition, the site has been deemed a National Historic Landmark.

The project consisted of the restoration of a historic hexagonal building with the recreation of a rectangular addition that was originally a hotel. The new addition houses a museum, research area and administrative offices for the Milton Historical Society. The masonry restoration on the hexagonal building had to meet original specifications, which included custom made lime gravel that was applied to complete the exterior. The original application of lime gravel on this structure was a precursor to poured in-place concrete. This structure is one of less than ten still existing in the United States.