As far as Wing Family History goes, this is true ground zero. A brief history:
The Wing Fort House, which was built in 1641, is recognized as the oldest home in New England continuously owned by the same family. Stephen Wing either purchased the homestead from the town of Sandwich or the town granted him the property around the time of his first marriage in 1646. Wing's descendants continued to live in the house until 1942. The house was added to the National Register of Historic Places in 1976. Tradition states that the home was at one time a fort to protect the earliest settlers from the Native Americans. The exterior of the "Old Fort" Room, the oldest part of the current structure, is composed of a double wall. Interestingly, since the Cape Cod Indians were found to be friendly, the town didn't need a fort for protection.
The cache is located away from the structure in a stand of trees. Please look only during daylight hours so as not to arouse the nieghbors. The caretaker of the property as well as the curator of the museum are aware of the cache. If you happen to be there when it's open you should check it out.