The Parson Thorne Mansion now functions as a museum which displays many furniture and art pieces from the 1700s to the 1900s. It was the home of Reverend Sydenham Thorne who was one of the considered founders of Milford. It is also once the home of the Delaware statesman John M. Clayton. The mansion was registered in the National Register of Historic Places in 1971.

Its historic significance is more on the architectural side on the period from 1700s to 1900s. Architecture enthusiasts will be delighted by this historic red brick building because the mansion shows many hints of changes in architectural styles. When the mansion shifted from owner to owner, the style shifted from Colonial Georgian architecture to Gothic Victorian. It is very interesting to see how these changes were incorporated even though it still holds a hit of Colonial Georgian style. The building is being administered by Milford Historical Society. The red brick mansion holds a rich history as it passes from owner to owner. The mansion offers tours for visitors from May to October.