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Is the headquarters of The Historical Society of Great Port Jefferson for most of the year but during July and August the House is open to the public to view the small museum. Within the museum is the Mather House, craft house & museum shop, country store, marine barn & sail loft, tool shed, and the spinney clock museum. Each building holds a collection of antiques from the original village in the 1800s. It is an informational tour for the curious local or uneducated tourist.