Edward and Mary Harkness had a number of homes in addition to Harkness House in New York.
They spent summers at their Eolia mansion on Long Island Sound in Waterford, Connecticut, near where Mary had visited her grandparents in the summers.
The home and 230 acres (93 ha) of ornamental gardens and grounds are now maintained by the State of Connecticut as Harkness Memorial State Park.

They also owned another house on Long Island in Manhasset, New York, on 186 acres called Weekend, designed by architect James Gamble Rogers, plus houses in North Carolina and California, and a camp in the Adirondacks.
They also spent time at the Jekyll Island Club  in Georgia and Yeamans Hall outside of Charleston, SC - another James Gamble Rogers golf and winter community.
Edward and Mary Harkness had a number of homes in addition to Harkness House in New York. They spent summers at their Eolia mansion on Long Island Sound in Waterford, Connecticut, near where Mary had visited her grandparents in the summers. The home and 230 acres (93 ha) of ornamental gardens and grounds are now maintained by the State of Connecticut as Harkness Memorial State Park.
They also owned another house on Long Island in Manhasset, New York, on 186 acres called Weekend, designed by architect James Gamble Rogers, plus houses in North Carolina and California, and a camp in the Adirondacks. They also spent time at the Jekyll Island Club  in Georgia and Yeamans Hall outside of Charleston, SC - another James Gamble Rogers golf and winter community.
Edward Harkness