This is one of the structures on the grounds of the arboretum. It is not used for anything and the inside is not open to visitors. I've always thought it might be a very charming place to live, especially if the grounds are included. This arboretum used to an estate. Here is some information taken from their website: "In 1908 two brothers used a small legacy to acquire their country home near Gladstone, New Jersey.

The two brothers, Henry and Robert Tubbs, and Henry’s adopted son, Dr. Benjamin Blackburn, developed this country place into the Willowwood Arboretum, New Jersey’s most comprehensive and longest continually operating Arboretum.

Since 1980 under the stewardship and management of the Morris County Park Commission, the Willowwood Foundation and the support and hard work of countless donors and volunteers have made it possible for the public to enjoy this beautiful green space of gardens and meadows."